Tag axle is in caster steered fault mode
• Check for other active OR passive primary DTCs, to find the root cause. • Check supply voltage. • Fix the root cause --> responsible primary fault is invalidated (DTC is set passive). • Make sure the tag axle wheels are free to steer (e.g. vehicle should not be on a lift). • Set the steering wheel in straight ahead position (steering wheel angle approximately 0°), Not necessary, but adviceable, since the tag axle wheels will match the steering wheel angle, after successful SelfTest. • Perform a Diagnostic SelfTest (requires Parking Brake to be applied), either by starting this routine in SDP3, or by a key OFF/ON toggle (with a 10 second pause in between). - If the root cause fault has been fixed, this DTC will be set passive.
What you'll see
• ESP system may react with Yellow Lamp shown in ICL.
System reaction
Red Steer tag axle fault warn EST in released mode
Diagnostic depth
The system has degraded itself into caster steered (Red warning) fault mode.
There are several faults / DTCs that can trigger this secondary DTC. The root cause to the error is related to another active OR passive primary DTC.