OBD Guide
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P1E22

Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost

P1E22 is an OBD-II diagnostic trouble code meaning: Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost. Common causes: damage to the insulation of high-voltage cables, problems with high voltage battery. Estimated repair cost: $167–556.

Severity
🚨 Critical
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Check Engine light comes on
  • Reducing power or turning off the hybrid system
  • High voltage warnings on the instrument panel
  • The car may go into emergency mode
  • Possible problems with charging the high-voltage battery

Causes

  • Damage to the insulation of high-voltage cables
  • Problems with high voltage battery
  • Transmission fluid auxiliary pump malfunction
  • Damage to high voltage system components
  • Short circuit to housing in high voltage circuit

How to Fix

  1. Carry out diagnostics of the high-voltage system
  2. Check the integrity of the insulation of all high-voltage cables
  3. Test the high voltage battery for leaks
  4. Check the operation of the auxiliary transmission fluid pump
  5. Repair only from an authorized dealer

Related codes

P1E00P1E01P0AA6

FAQ

What does the P1E22 code mean?

P1E22 is an OBD-II diagnostic trouble code that indicates: Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage System Isolation Lost

What causes a P1E22 error code?

The most common causes of P1E22 include: Damage to the insulation of high-voltage cables; Problems with high voltage battery; Transmission fluid auxiliary pump malfunction; Damage to high voltage system components.

How do I fix a P1E22 diagnostic trouble code?

To fix P1E22: Carry out diagnostics of the high-voltage system. Check the integrity of the insulation of all high-voltage cables. Test the high voltage battery for leaks. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1E22?

Do not drive — repair immediately

How much does it cost to fix P1E22?

The estimated repair cost for P1E22 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat