OBD Guide
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P1651

PCM Output Controls Fault

P1651 is an OBD-II diagnostic trouble code meaning: PCM Output Controls Fault. Common causes: pcm malfunction, open or short circuit in control circuit. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Unstable engine operation
  • Power dips
  • Check Engine Light Illuminates
  • Disabling some engine management systems
  • Gear shifting problems (on automatic transmissions)

Causes

  • PCM malfunction
  • Open or short circuit in control circuit
  • Poor contact in PCM connectors
  • PCM power problems
  • Contact corrosion

How to Fix

  1. Check PCM Memory Error Codes
  2. Check the integrity of the wiring harness to the PCM
  3. Check contacts in PCM connectors
  4. Check PCM power and ground
  5. Replace PCM if necessary

Related codes

P1650P1652P1653

Error P1651 by Vehicle Brand

BuickCadillacChevroletFordGMGMCLincolnMazdaMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1651 code mean?

P1651 is an OBD-II diagnostic trouble code that indicates: PCM Output Controls Fault

What causes a P1651 error code?

The most common causes of P1651 include: PCM malfunction; Open or short circuit in control circuit; Poor contact in PCM connectors; PCM power problems.

How do I fix a P1651 diagnostic trouble code?

To fix P1651: Check PCM Memory Error Codes. Check the integrity of the wiring harness to the PCM. Check contacts in PCM connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1651?

Yes, but get it checked soon

How much does it cost to fix P1651?

The estimated repair cost for P1651 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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