OBD Guide
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P303D

Hybrid/EV Battery Interface Control Module 12 Random Access Memory

P303D is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Interface Control Module 12 Random Access Memory. Common causes: control module ram failure, module power problems. 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
  • The car goes into emergency mode
  • Hybrid system power reduction
  • Problems with charging a high-voltage battery
  • Incorrect battery level readings

Causes

  • Control module RAM failure
  • Module power problems
  • Software errors in the module
  • Wiring harness damage
  • Contact corrosion

How to Fix

  1. Diagnostics of the control module using a scanner
  2. Checking power and grounding circuits
  3. Module software update
  4. Checking and cleaning contacts
  5. Replacing the interface module if necessary

Related codes

P303CP303EP0A00

FAQ

What does the P303D code mean?

P303D is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Interface Control Module 12 Random Access Memory

What causes a P303D error code?

The most common causes of P303D include: Control module RAM failure; Module power problems; Software errors in the module; Wiring harness damage.

How do I fix a P303D diagnostic trouble code?

To fix P303D: Diagnostics of the control module using a scanner. Checking power and grounding circuits. Module software update. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P303D?

Limited driving only, diagnose soon

How much does it cost to fix P303D?

The estimated repair cost for P303D is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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