OBD Guide
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P1AA8

Starter/Generator Field Control Performance

P1AA8 is an OBD-II diagnostic trouble code meaning: Starter/Generator Field Control Performance. Common causes: generator malfunction, wiring harness damage. Estimated repair cost: $56–222.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Check Engine Light Is On
  • Battery charging problems
  • Unstable operation of the electrical system
  • Difficulty starting the engine

Causes

  • Generator malfunction
  • Wiring harness damage
  • Problems with the control module
  • Short circuit in the circuit
  • Oxidation of contacts

How to Fix

  1. Check the condition of the generator
  2. Inspect the wiring harness for damage
  3. Check the voltage at the battery terminals
  4. Scan the control module for errors
  5. Clean and treat contacts

Related codes

P1AA7P1AA9P0562

FAQ

What does the P1AA8 code mean?

P1AA8 is an OBD-II diagnostic trouble code that indicates: Starter/Generator Field Control Performance

What causes a P1AA8 error code?

The most common causes of P1AA8 include: Generator malfunction; Wiring harness damage; Problems with the control module; Short circuit in the circuit.

How do I fix a P1AA8 diagnostic trouble code?

To fix P1AA8: Check the condition of the generator. Inspect the wiring harness for damage. Check the voltage at the battery terminals. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1AA8?

Limited driving only, diagnose soon

How much does it cost to fix P1AA8?

The estimated repair cost for P1AA8 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat