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OBD Code C0243

ABS Pump Motor Circuit Open

CodeC0243
DescriptionABS Pump Motor Circuit Open
Possible CausesOpen circuit to ABS pump|Blown fuse|Wiring break
SymptomsABS pump inoperative|ABS disabled
SystemChassis

What Does C0243 Mean?

ABS Pump Motor Circuit Open. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the chassis.

Code Breakdown

C = Chassis code

0 = Generic (SAE standard)

How to Fix C0243

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check brake fluid level and condition.
  2. Inspect the ABS hydraulic modulator unit for leaks.
  3. Check all ABS valve solenoid connectors.
  4. Test the ABS pump motor — it should run briefly when commanded by the scan tool.
  5. Bleed the ABS system following manufacturer-specific procedure (usually requires a scan tool).
  6. If the hydraulic unit has internal leaks, replacement is required.
  7. Clear codes and verify ABS operation.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is C0243 serious?

Yes — C0243 is considered a critical-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear C0243 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix C0243?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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