OBD Guide
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P1E91

Hybrid/EV Battery Interface Control Module 1 Long Term Memory Performance

P1E91 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Interface Control Module 1 Long Term Memory Performance. Common causes: module software failure, damage to the module's long-term memory. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–556 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced hybrid system efficiency
  • Problems with charging a high-voltage battery
  • Vehicle power limitation
  • Incorrect battery status indicators

Causes

  • Module software failure
  • Damage to the module's long-term memory
  • Module power problems
  • Corroded or damaged connectors
  • High voltage battery fault

How to Fix

  1. Conduct module diagnostics using a scanner
  2. Check power supply and grounding of the module
  3. Inspect connectors and wiring harness for damage
  4. Try to reflash the module
  5. If necessary, replace the control module

Related codes

P1E90P1E92P0A80

FAQ

What does the P1E91 code mean?

P1E91 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Interface Control Module 1 Long Term Memory Performance

What causes a P1E91 error code?

The most common causes of P1E91 include: Module software failure; Damage to the module's long-term memory; Module power problems; Corroded or damaged connectors.

How do I fix a P1E91 diagnostic trouble code?

To fix P1E91: Conduct module diagnostics using a scanner. Check power supply and grounding of the module. Inspect connectors and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1E91?

Limited driving only, diagnose soon

How much does it cost to fix P1E91?

The estimated repair cost for P1E91 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat