OBD Guide
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P1065

ECM Power Supply Circuit

P1065 is an OBD-II diagnostic trouble code meaning: ECM Power Supply Circuit. Common causes: blown fuse, faulty ecu power relay. Estimated repair cost: $1–56.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$1–56 (est.)

Symptoms

  • Engine won't start
  • Unstable engine operation
  • Power Loss
  • Check Engine Light Is On
  • The ECU may shut down completely

Causes

  • Blown fuse
  • Faulty ECU power relay
  • Open or short circuit in wiring
  • Poor contact in ECU connectors
  • Malfunction of the ECU itself

How to Fix

  1. Check and replace the ECU power supply fuse
  2. Check the ECU power relay and replace if necessary
  3. Inspect the wiring harness for damage
  4. Check the contacts in the ECU connectors
  5. If all of the above are OK, the ECU may need to be replaced.

Related codes

P0600P0601P0602

FAQ

What does the P1065 code mean?

P1065 is an OBD-II diagnostic trouble code that indicates: ECM Power Supply Circuit

What causes a P1065 error code?

The most common causes of P1065 include: Blown fuse; Faulty ECU power relay; Open or short circuit in wiring; Poor contact in ECU connectors.

How do I fix a P1065 diagnostic trouble code?

To fix P1065: Check and replace the ECU power supply fuse. Check the ECU power relay and replace if necessary. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1065?

Do not drive — repair immediately

How much does it cost to fix P1065?

The estimated repair cost for P1065 is $1–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat