What Does C1270 Mean?
The ABS module has detected a failure in the ABS pump motor #1 input circuit. The pump motor is responsible for pressurizing the ABS hydraulic accumulator and cycling brake fluid during ABS, traction control, and stability control events. Without a functioning pump motor, the ABS cannot modulate brake pressure, and all electronic brake functions are disabled.
Common Causes
35%
Failed ABS pump motor (brushes worn, armature failure, or seized bearings)
25%
Open or damaged wiring in the pump motor power or ground circuit
20%
Failed ABS pump motor relay not providing power to the motor
10%
Corroded connector at the pump motor or ABS module preventing current flow
10%
ABS module internal driver failure for the motor circuit
Diagnostic Steps
1
Command the ABS pump motor on via bi-directional scan tool control. Listen for motor operation. No motor sound indicates a power supply, motor, or control issue.
2
Check for power at the pump motor connector when commanded on — expect battery voltage. No voltage means the relay, wiring, or module driver is not energizing the circuit.
3
Measure pump motor resistance across its terminals — typical is 0.5-2.0 ohms. An open circuit indicates motor failure; extremely low resistance may indicate an internal short.
4
Verify the ABS pump relay is functioning — swap with an identical relay from the fuse box and retest. Check relay coil resistance (50-80 ohms typical) and contact continuity.
5
If power reaches the motor but it does not run, the motor is mechanically seized or electrically failed. Check for free rotation by applying 12V directly (briefly) to the motor terminals.
6
Inspect all connectors and wiring in the pump motor circuit for corrosion, heat damage, or loose connections.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The ABS module has detected a failure in the ABS pump motor #1 input circuit. The pump motor is responsible for pressurizing the ABS hydraulic accumulator and cycling brake fluid during ABS, traction control, and stability control events. Without a functioning pump motor, the ABS cannot modulate bra...
The most common cause of C1270 (Motor # 1 Input Circuit Failure) is: Failed ABS pump motor (brushes worn, armature failure, or seized bearings)
Typical repair costs for C1270 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
All ABS, traction control, and stability control functions are disabled. Normal braking is fully operational, but the vehicle will not have anti-lock braking or electronic stability assistance. Drive carefully, maintain extra following distance, and avoid aggressive maneuvers. Repair as soon as practical.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1270 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control
Difficulty
Type
Manufacturer
Recommended Tools
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