OBD Guide
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P1E21

Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage

P1E21 is an OBD-II diagnostic trouble code meaning: Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage. Common causes: damage to the wiring harness in the voltage control circuit, poor contact in the control module connectors. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Possible problems with gear shifting
  • Reduced performance of the hybrid system
  • Warning messages appear on the instrument panel
  • In some cases - transition to emergency operation mode

Causes

  • Damage to the wiring harness in the voltage control circuit
  • Poor contact in the control module connectors
  • Auxiliary pump control module malfunction
  • Problems with the hybrid/electric battery
  • Short circuit in voltage control circuit

How to Fix

  1. Check the condition of the wiring harness and connectors in the control circuit
  2. Check voltage in control circuit
  3. Test the auxiliary pump control module
  4. If necessary, replace the control module
  5. Check the condition of the hybrid/electric battery

Related codes

P1E20P1E22P0A80

FAQ

What does the P1E21 code mean?

P1E21 is an OBD-II diagnostic trouble code that indicates: Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage

What causes a P1E21 error code?

The most common causes of P1E21 include: Damage to the wiring harness in the voltage control circuit; Poor contact in the control module connectors; Auxiliary pump control module malfunction; Problems with the hybrid/electric battery.

How do I fix a P1E21 diagnostic trouble code?

To fix P1E21: Check the condition of the wiring harness and connectors in the control circuit. Check voltage in control circuit. Test the auxiliary pump control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1E21?

Limited driving only, diagnose soon

How much does it cost to fix P1E21?

The estimated repair cost for P1E21 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat