OBD Guide
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P1D09

EP-CAN A Malfunction BUS-OFF Battery Condition Monitor Module

P1D09 is an OBD-II diagnostic trouble code meaning: EP-CAN A Malfunction BUS-OFF Battery Condition Monitor Module. Common causes: open or short circuit in the ep-can a bus circuit, battery monitoring module malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Battery charging problems
  • Incorrect battery status readings
  • Malfunctions of other electronic systems

Causes

  • Open or short circuit in the EP-CAN A bus circuit
  • Battery monitoring module malfunction
  • Problems with contacts in connectors
  • Corroded or damaged wiring
  • Software failure in the module

How to Fix

  1. Check the integrity of the EP-CAN A bus wiring
  2. Inspect the connectors and contacts of the module
  3. Check the power supply and ground of the module
  4. Scan other modules for related errors
  5. If necessary, replace the battery monitoring module

Related codes

P1D08P1D0AU0100

FAQ

What does the P1D09 code mean?

P1D09 is an OBD-II diagnostic trouble code that indicates: EP-CAN A Malfunction BUS-OFF Battery Condition Monitor Module

What causes a P1D09 error code?

The most common causes of P1D09 include: Open or short circuit in the EP-CAN A bus circuit; Battery monitoring module malfunction; Problems with contacts in connectors; Corroded or damaged wiring.

How do I fix a P1D09 diagnostic trouble code?

To fix P1D09: Check the integrity of the EP-CAN A bus wiring. Inspect the connectors and contacts of the module. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1D09?

Yes, but get it checked soon

How much does it cost to fix P1D09?

The estimated repair cost for P1D09 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat