OBD Guide
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P1A51

Drive Motor 1 Control Module Read Only Memory

P1A51 is an OBD-II diagnostic trouble code meaning: Drive Motor 1 Control Module Read Only Memory. Common causes: damage to the motor controller software, control module power problems. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced engine power
  • Switching to emergency mode
  • Problems starting the engine
  • Unstable operation of the hybrid system

Causes

  • Damage to the motor controller software
  • Control module power problems
  • Short circuit in the controller circuit
  • Mechanical damage to the module
  • Corrosion of contacts or connectors

How to Fix

  1. Check fault codes and freeze frame data
  2. Test the control module power circuit
  3. Inspect connectors and wiring harness for damage
  4. Update or reflash the control module software
  5. If necessary, replace motor control module 1

Related codes

P1A50P1A52P1A53

FAQ

What does the P1A51 code mean?

P1A51 is an OBD-II diagnostic trouble code that indicates: Drive Motor 1 Control Module Read Only Memory

What causes a P1A51 error code?

The most common causes of P1A51 include: Damage to the motor controller software; Control module power problems; Short circuit in the controller circuit; Mechanical damage to the module.

How do I fix a P1A51 diagnostic trouble code?

To fix P1A51: Check fault codes and freeze frame data. Test the control module power circuit. Inspect connectors and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A51?

Limited driving only, diagnose soon

How much does it cost to fix P1A51?

The estimated repair cost for P1A51 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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