2017 Mercedes Benz C 43 AMG Diagnostic and Repair# P-42_30-103 Date: 090113

Brakes - ABS Pump Runs Continuously/Code C1401 Set
Date: January 13, 2009
Order No.: P-B-42.30/103
Supersedes:
Group: 42
Mercedes Benz C 43 AMG (202.033) V8-4.3L (113.944) Page 348
SUBJECT:
All Model 202 Vehicles, Equipped with Anti-lock Brake System (ABS) (Code 470a)
All Model 208 Vehicles, Equipped with Anti-lock Brake System (ABS) (Code 470a)
ABS Return Flow Pump Runs Without Control
If you receive customer reports in the above model vehicles of the Anti-Lock Brake System (ABS) return flow pump running without control with
corresponding fault code C1401, clean and insulate the connector for the return flow pump relay. Refer to WIS document GF42.30-P-0003-09B.
Note:
Due to standardization of the ABS wire harness for both the Bosch and ITT systems, the plug for the return flow pump is not assigned on ITT
systems. As such, oxidation can occur within the plug causing the return flow pump in the ABS hydraulic unit to start.