Error code P1065 on Nissan Murano - one of those problems that can unsettle even experienced car owners. Unlike common faults related to sensors or the ignition system, this error often indicates problems in electronic engine control system (ECU) or power circuits. Depending on the year of manufacture and modification Murano (Z50, Z51, Z52), the manifestations of the error can range from minor glitches to complete loss of power.

What makes this mistake especially insidious is that it unpredictability. On some cars it appears sporadically and disappears after restarting the engine, on others it leads to activation of the mode Limp Mode (emergency power limitation). In this article we will look at what exactly is hidden behind the code. P1065, how to correctly diagnose it and what steps to take to eliminate it - from the simplest fuse check to complex procedures with flashing the ECU.

What does error code P1065 mean on Nissan Murano?

Code P1065 in the diagnostic system Nissan stands for "Power Supply Voltage Malfunction". Unlike generic OBD-II codes (such as P0300), this code is productive and vehicle specific Nissan/Infiniti. It signals that The engine control module (ECU) has detected an anomaly in the power circuit - either too low or unstable voltage.

It is important to understand that P1065 - this is not a direct indication of the breakdown of a specific sensor or wire. This is rather an “alarm signal” that can be caused by a number of reasons:

  • 🔋 Battery problems (low charge, sulfation, internal short circuit)
  • ⚡ Malfunction of the generator or voltage regulator relay
  • 🔌 Corrosion or breakage in the ECU power circuits (especially on the connectors E30 And E31)
  • 🛠️ Malfunctions in the operation of the control unit itself (overheating, damage to microcircuits, firmware errors)
  • 🔧 Problems with the “ground” of the engine or body (oxidation of contacts)

On Nissan Murano with engines VQ35DE (3.5 l) and QR25DE (2.5 l) error P1065 often accompanied by additional codes such as P0603 (ECU memory error) or P0607 (malfunction of the detonation channel). This complicates diagnosis as symptoms may overlap.

⚠️ Attention: If the error P1065 appears along with P0335 (crankshaft position sensor malfunction), stop driving immediately. The combination of these codes may indicate critical ignition timing problems, which can result in engine damage.

Symptoms of error P1065: how it manifests itself on Nissan Murano

Manifestations of the error P1065 depend on the degree of malfunction and model Murano. On first-generation cars (Z50, 2003–2007), symptoms are usually more pronounced than on restyled versions (Z51, 2009–2014). Here are the typical signs:

  • 🚗 The engine starts with difficulty or requires several attempts
  • ⚡ Lights up on the dashboard Check Engine (sometimes flashes)
  • 🐢 The car loses power, especially when accelerating (activated Limp Mode)
  • 🔄 Engine speed “floats” at idle (from 500 to 1500 rpm)
  • 🔊 Extraneous sounds from the fuse box (relay clicks, crackling sounds)
  • 💡 Dim headlights or flickering dashboard when the engine is running

On Murano with variator JF011E error P1065 can lead to jerking when changing gears or blocking the gearbox in one range. This is due to the fact that the ECU transmits incorrect data to the transmission control unit (TCM).

Symptom Probable Cause Urgency of elimination
The engine stalls immediately after starting Critically low voltage in the ECU circuit or firmware failure ⭐⭐⭐⭐⭐ (immediately)
Loss of power during acceleration Activation Limp Mode due to unstable power supply ⭐⭐⭐⭐ (within 1–2 days)
Dashboard flickering Alternator or battery problems ⭐⭐⭐ (within a week)
The error only appears on cold start Contact oxidation or temperature sensor malfunction ⭐⭐ (planned)

If the error P1065 accompanied by generator hum or burning smell from under the hood, this may indicate a short circuit in the circuit. In this case, it is recommended to disconnect the battery and contact an electrician.

📊 How often do you get error P1065?
  • First time
  • Occasionally (once a month)
  • Constantly (every day)
  • Only on cold start

Causes of error P1065: from simple to complex

Diagnosis of the error P1065 on Nissan Murano should proceed according to the principle “from simple to complex”. Start by checking elements that can be inspected without specialized equipment, and only then move on to in-depth diagnostics.

1. Battery problems

The most common reason is discharged or faulty battery. On Murano with the system Intelligent Key even a small voltage drop is lower 11.8 V may cause an error. Check:

  • 🔋 The voltage at the terminals when the engine is off (should be 12.4–12.7 V)
  • 🔌 Terminal condition (oxidation, poor contact)
  • 📉 Voltage drop at startup (should not fall below 9.5 V)

2. Generator malfunctions

If the battery is OK but there is an error P1065 appears when the engine is running, it may be the culprit generator. On Murano with engine VQ35DE often fails voltage regulator relay, which leads to surges in the charging current. Normal voltage at idle - 13.8–14.5 V. If it is lower 13 V or higher 15 V, the generator requires repair.

3. Problems with ECU power circuits

Engine control unit (ECU) on Murano receives power through several circuits:

  • Ignition Switch (15A) — power when the ignition is on
  • Main Relay (10A) - basic nutrition
  • Back-up Power (7.5A) - backup power for memory

Check the fuses in the box under the hood (marked as Engine Control) and relay ECCS Relay. Also inspect the connectors E30 (white) and E31 (black) on the ECU itself - they often oxidize or have damaged contacts.

4. Failures in ECU firmware

On Murano 2005–2010 model years, it is not uncommon for an error P1065 arises due to damaged firmware control unit. This may happen after:

  • 🔌 Incorrect battery disconnection
  • ⚡ Voltage surge in the on-board network
  • 🛠️ Unsuccessful chip tuning

In such cases, flashing the ECU is required using Nissan Consult III or similar scanner.

⚠️ Attention: If after resetting the error P1065 it returns after 5–10 minutes, this may indicate malfunction of the ECU itself. In this case, the unit must be replaced or repaired at a specialized stand.

Check battery voltage|Inspect terminals and ground|Check ECU power circuits|Check alternator at idle|Read additional faults with scan tool-->

How to Diagnose Error P1065: Step-by-Step Instructions

To accurately diagnose the error P1065 on Nissan Murano you will need:

  • 🔧 Multimeter (to check voltage)
  • 🔍 Diagnostic scanner (for example, Launch X431 or Nissan Consult)
  • 📖 Wiring diagram for your model (can be found in Nissan Service Manual)

Step 1: Checking the Battery and Alternator

  1. Turn off the ignition, connect a multimeter to the battery terminals. The voltage should be 12.4–12.7 V.
  2. Start the engine. The no-load voltage should rise to 13.8–14.5 V.
  3. Turn on the headlights, heater and other consumers. The voltage should not drop below 13 V.

Step 2: Checking fuses and relays

Open the fuse box under the hood (next to the battery) and check:

  • Fuse 32 (10A) - ECU power supply
  • Fuse 41 (15A) - ignition
  • ECCS Relay — engine control system relay

If the fuses are intact, but the error remains, check the circuits from the battery to the ECU for breaks.

Step 3: Diagnostics with a scanner

Connect the diagnostic scanner and:

  1. Read all saved errors (pay special attention to P0600–P0699 - ECU related codes).
  2. View voltage parameters in real time (Battery Voltage, ECU Power Supply).
  3. Check the data from the crankshaft position sensor (CKP) - in case of error P1065 they may be unstable.

Step 4: Checking ECU Connectors

Engine control unit on Murano located behind the glove compartment (on Z50 models) or under the hood (on Z51). Disconnect the connectors E30 And E31, inspect them for:

  • 🔥 Burnt or melted contacts
  • 💧 Traces of corrosion or moisture
  • 🔌 Bent or missing pins

Clean the contacts with alcohol and check the reliability of fastening.

What should I do if P1065 only appears when the engine is cold?

In 80% of cases this is due to oxidation of contacts in the ECU power circuit or a malfunction coolant temperature (ECT) sensor. Try:

  1. Clean the ECU connector contacts and ground wires.
  2. Replace the ECT sensor (cost ~1500 rubles).
  3. Check the power circuit for microcracks (they can only appear at low temperatures).

How to fix error P1065: from repair to ECU replacement

How to resolve the error P1065 depends on its root cause. Below we will look at solutions for each of the possible scenarios.

1. If the problem is in the battery or generator

  • 🔋 Low battery: Charge it or replace it. On Murano It is recommended to use a battery with a capacity of at least 70 Ah.
  • ⚡ Faulty generator: Replace the relay-regulator (cost ~2000 rubles) or the generator assembly (~15,000 rubles).
  • 🔌 Bad contact: Clean the battery terminals and ground on the body (usually located under the hood next to the battery).

2. If the problem is in the ECU power circuits

To repair power circuits:

  1. Run the wires from the battery to the ECU (use the wiring diagram for your model).
  2. Replace damaged wiring sections or connectors.
  3. Check fuses Engine Control - they may be externally intact, but have microcracks.

3. If the problem is in the ECU itself

In this case, there are three options:

  • 🛠️ Flashing: If the error is caused by a software failure, the unit can be reflashed (cost ~5000 rubles).
  • 🔧 Repair: At specialized stands, damaged tracks or microcircuits are restored (from ~10,000 rubles).
  • 🆕 Replacement: A new ECU will cost ~30,000–50,000 rubles, a used one - from ~15,000 rubles. After replacement you will need immobilizer initialization.
⚠️ Attention: When replacing the ECU with Nissan Murano with the system NAT (Nissan Anti-Theft) will be required rewriting the immobilizer PIN code. Without this, the engine will not start. The procedure can only be performed using Nissan Consult III/IV.
💡

If after repair there is an error P1065 disappeared, but the engine is unstable, perform reset adaptations through a diagnostic scanner. This will help the ECU “forget” the old parameters and reconfigure itself.

Prevention of error P1065: how to avoid recurrence

To make a mistake P1065 did not return after repair, follow these recommendations:

  • 🔋 Check your battery voltage regularly (especially before winter).
  • ⚡ Once a year, clean the battery terminals and the mass on the body from oxidation.
  • 🛠️ When working with electricity (for example, installing an alarm), always disconnect the battery to avoid voltage surges.
  • 🔌 Use only high-quality fuses and relays (original Nissan or proven analogues, for example, Hella).
  • 💾 Avoid “handicraft” chip tuning - incorrect firmware can damage the ECU.

On Murano with a mileage of more than 150,000 km, it is recommended to check the condition of the ECU connectors every 2–3 years and, if necessary, treat them contact lubricant (For example, Liqui Moly Electronic-Spray). This will prevent oxidation and microcracks.

💡

Most vulnerable to error P1065 Nissan Murano 2005–2008 with engine VQ35DE. On these models, the generator relay regulator often fails and the ECU contacts oxidize.

Frequently asked questions about error P1065 on Nissan Murano

Is it possible to drive with P1065?

Short driving is possible, but not recommended. If the error is accompanied loss of power or unstable engine operation, further movement may lead to:

  • Damage to the catalyst due to incorrect fuel mixture.
  • Engine overheating (if the error is related to the sensors).
  • Complete ECU failure.

If the error appears sporadically and does not affect driving performance, you can go to a service station, but do not delay diagnosis for too long.

How much does it cost to repair error P1065?

The cost depends on the reason:

Reason Repair cost (RUB)
Battery replacement 5 000–10 000
Generator repair (replacement of relay regulator) 2 000–4 000
ECU replacement (new) 30 000–50 000
ECU flashing 3 000–7 000
Wiring repair 1,500–10,000 (depending on complexity)

On average, error elimination P1065 costs 3,000–15,000 rub.if the problem is not in the ECU itself.

Can P1065 appear after washing the engine?

Yes, this is one of the common reasons. Water entering the ECU connectors or alternator contacts can cause short circuits or corrosion. If the error appears after washing:

  1. Dry the engine compartment with compressed air.
  2. Process contacts WD-40 or Liqui Moly Electronic-Spray.
  3. Check the fuses - they may have blown due to a power surge.

Usually, after drying, the error disappears on its own after 1-2 engine starts.

How to reset error P1065 without a scanner?

On Nissan Murano You can try to reset the error by disconnecting the battery:

  1. Disconnect the negative terminal of the battery.
  2. Wait 10-15 minutes (this will allow the capacitors in the ECU to discharge).
  3. Reconnect the terminal and start the engine.

If the error was episodic (for example, due to a power surge), it will disappear. However, if the cause is a malfunction, the error will return.

⚠️ Attention: On Murano with the system Intelligent Key Disconnecting the battery may reset the radio and climate control settings. You may also need to reinitialize the windows (raise and lower them all the way after connecting the battery).
Where is the ECU located on a Nissan Murano?

The location of the control unit depends on the generation:

  • Z50 (2003–2007): Behind the glove compartment. To gain access, remove the glove compartment (unscrew the 4 screws Torx T20 and disconnect the connectors).
  • Z51 (2008–2014): Under the hood, next to the battery (in a plastic box).

On both models, the ECU has two connectors: E30 (white, 80 pins) and E31 (black, 40 contacts).