C1544 Engine Trouble Code
What is C1544?
C1544 code can indicate a faulty oxygen sensor, which may eventually damage the catalytic converter (repair cost: $2,000–$2,200). Professional diagnosis costs around $200–$210. Oxygen sensors are often straightforward to replace — check your owner's manual for location and instructions. This issue should be addressed promptly to prevent further damage.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C1544 |
C1544 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
C1544 Code Structure
Understanding what each digit means in the C1544 chassis trouble code:
| C | 1 | 5 | 4 | 4 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering | Fuel Composition Sensor Circuit Malfunction | Injection Pump Fuel Metering Control 'B' High | Timing Reference High Resolution Signal A Too Many Pulses |
How to Fix C1544
Diagnostic Steps:
Regarding C1544, carefully inspect the wire harness near the intake manifold bracket, best accessed from below near the oil filter. Look for chafing, pinching, or damaged insulation.
Repair Solution:
Excessive air inflow may result from vacuum leaks, dirty sensors, or EGR valves not closing properly. Insufficient fuel can stem from dirty injectors, clogged filters, weak fuel pump, or leaking pressure regulator.
Technical Notes:
C1544 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
C1544 Description
C1544 engine trouble code is related to Timing Reference High Resolution Signal A Too Many Pulses.
Main Cause
The primary reason for C1544 OBD-II Engine Trouble Code is: Fuel Composition Sensor Circuit Malfunction.