OBD Guide
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P1AB4

Starter/Generator Phase U Current Sensor Circuit High Voltage

P1AB4 is an OBD-II diagnostic trouble code meaning: Starter/Generator Phase U Current Sensor Circuit High Voltage. Common causes: phase u sensor fault, open or short circuit in the sensor circuit. Estimated repair cost: $28–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$28–89 (est.)

Symptoms

  • Check Engine Light Is On
  • Hybrid system power reduction
  • Battery charging problems
  • Disabling the start-stop system
  • Unstable generator operation

Causes

  • Phase U sensor fault
  • Open or short circuit in the sensor circuit
  • Wiring Harness Problems
  • Generator control module malfunction
  • Contact corrosion

How to Fix

  1. Check the continuity of the phase sensor circuit U
  2. Check sensor resistance and voltage
  3. Inspect connectors and wiring harness for damage
  4. Test the generator control module
  5. Replace phase U sensor if necessary

Related codes

P1AB5P1AB6P0A94

FAQ

What does the P1AB4 code mean?

P1AB4 is an OBD-II diagnostic trouble code that indicates: Starter/Generator Phase U Current Sensor Circuit High Voltage

What causes a P1AB4 error code?

The most common causes of P1AB4 include: Phase U sensor fault; Open or short circuit in the sensor circuit; Wiring Harness Problems; Generator control module malfunction.

How do I fix a P1AB4 diagnostic trouble code?

To fix P1AB4: Check the continuity of the phase sensor circuit U. Check sensor resistance and voltage. Inspect connectors and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1AB4?

Yes, but get it checked soon

How much does it cost to fix P1AB4?

The estimated repair cost for P1AB4 is $28–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat