OBD Guide
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P1640

Output Driver Module 'A' Error Conditions

P1640 is an OBD-II diagnostic trouble code meaning: Output Driver Module 'A' Error Conditions. Common causes: output module 'a' faulty, open or short circuit in control circuit. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Check Engine light comes on
  • The car goes into emergency mode
  • Reduced engine power
  • Unstable engine operation
  • Failure of some electronic systems

Causes

  • Output module 'A' faulty
  • Open or short circuit in control circuit
  • Poor contact in module connectors
  • Module power problems
  • Engine control unit malfunction

How to Fix

  1. Check the integrity of the module control circuit
  2. Check contacts in module connectors
  3. Check the power supply and ground of the module
  4. Test output module 'A'
  5. Replace the module if necessary

Related codes

P1639P1641P1642

Error P1640 by Vehicle Brand

BMWBuickCadillacChevroletFordGMGMCLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1640 code mean?

P1640 is an OBD-II diagnostic trouble code that indicates: Output Driver Module 'A' Error Conditions

What causes a P1640 error code?

The most common causes of P1640 include: Output module 'A' faulty; Open or short circuit in control circuit; Poor contact in module connectors; Module power problems.

How do I fix a P1640 diagnostic trouble code?

To fix P1640: Check the integrity of the module control circuit. Check contacts in module connectors. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1640?

Limited driving only, diagnose soon

How much does it cost to fix P1640?

The estimated repair cost for P1640 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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