Code Definition

C1A20 (64) — Pressure Increases Too Slow When Filling Reservoir

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Land Rover

About C1A20

C1A20 is a manufacturer-specific chassis diagnostic trouble code recorded for Land Rover vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1A20 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1A20 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC C1A20:64 is set by the Suspension Control Module when the air suspension compressor is commanded to fill the air reservoir, but the monitored reservoir pressure rises slower than the calibrated minimum rate. The fault is logged when the expected pressure increase is not achieved within a specified time window, indicating insufficient air delivery or excessive pressure loss during the fill. This affects the system ability to maintain or adjust ride height, so the driver may notice the vehicle rising slowly or failing to reach height, the compressor running for extended periods or overheatin...

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