C1956 Engine Trouble Code
What is C1956?
With C1956, you may drive for several weeks with a malfunctioning MAF sensor, but expect decreased fuel economy and eventual stalling. Shop replacement costs $240–$400 depending on vehicle. The labour is straightforward, with most cost from the part itself.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C1956 |
C1956 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
C1956 Code Structure
Understanding what each digit means in the C1956 chassis trouble code:
| C | 1 | 9 | 5 | 6 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering | Injector Circuit Malfunction - Cylinders | Cylinder 1 Injector Circuit Low | Ignition Coil A Primary/Secondary Circuit Malfunction |
How to Fix C1956
Diagnostic Steps:
Poor running symptoms align with MAP sensor malfunction. In some cases, a faulty MAP sensor will not trigger a code. The issue may represent separate wiring concerns requiring individual diagnosis.
Repair Solution:
Crankshaft position sensor signals the computer for precise ignition and fuel injection timing. Faulty sensors cause rough running and reduced efficiency. Modern vehicles enter limp mode and illuminate the check-engine light.
Technical Notes:
Parts or components should not be replaced based solely on C1956 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
C1956 Description
C1956 engine trouble code is related to Ignition Coil A Primary/Secondary Circuit Malfunction.
Main Cause
The primary reason for C1956 OBD-II Engine Trouble Code is: Injector Circuit Malfunction - Cylinders.