C221B on Jeep
EDLFailSts Signal Not Valid From BRAKE7 Message
C221B on Jeep vehicles indicates edlfailsts signal not valid from brake7 message. Au7o has documented this code across 1 Jeep model — most commonly on Renegade. The Drivetrain Control Module receives an electronic-differential-lock fail-status signal (EDLFailSts) inside the BRAKE7 CAN message broadcast by the ABS/ESC module. C221B sets when that signal arrives invalid or implausible, so the DTCM cannot trust the brake-system status it needs to arbitrate the AWD disconnect/reconnect strategy. The common suffix is C221B-64 (signal plausibility failure). Important caveat from the FCA bulletin: on Renegade/500X this code, together with C2502-64, can latch Active *erroneously* simply because a scan tool interrogated the ABS module during a diagnostic session — FCA instructs the technician to disconnect the tool, drive the vehicle ~100 feet, reconnect and read All DTCs before starting any repair. It is therefore frequently a companion/secondary code rather than the fault itself. Typical repair costs on Jeep range from $1,200 to $2,800, depending on the specific model and root cause.
Common Causes of C221B
- •Fault or stored DTC in the ABS/ESC module that corrupts the BRAKE7 message
- •CAN bus wiring/connector fault between ABS module and DTCM
- •Erroneous setting during a scan-tool diagnostic session (documented FCA behavior — re-verify after driving the vehicle)
- •Outdated DTCM software (addressed by DTCM reflash bulletins)
C221B on Jeep by Model
Jeep Renegade(1 issue)
- Power Transfer Unit (PTU) / Rear Drive Unit Failure and AWD Driveline Whine2015-2023
On 4x4/AWD Renegades (which share FCA's Small Wide platform with the Jeep Compass and Cherokee/Chrysler 200), the Power Transfer Unit and rear drive unit are a recurring weak point. Owners report a growing whine or growl that rises and falls with speed, a rumble/vibration felt around 30-35 mph, and eventually a 'Service 4WD' warning. The PTU actuator and internal gears, plus the electronically controlled rear-clutch pack, wear or seize, sometimes leaving the vehicle undrivable in AWD. Note: in the US market AWD Renegades use the 2.4L; the 1.4L was FWD-only.
Looking for C221B on a different make?
View C221B across all makes →Frequently Asked Questions
What does C221B mean on Jeep?▼
C221B stands for "EDLFailSts Signal Not Valid From BRAKE7 Message." The Drivetrain Control Module receives an electronic-differential-lock fail-status signal (EDLFailSts) inside the BRAKE7 CAN message broadcast by the ABS/ESC module. C221B sets when that signal arrives invalid or implausible, so the DTCM cannot trust the brake-system status it needs to arbitrate the AWD disconnect/reconnect strategy. The common suffix is C221B-64 (signal plausibility failure). Important caveat from the FCA bulletin: on Renegade/500X this code, together with C2502-64, can latch Active *erroneously* simply because a scan tool interrogated the ABS module during a diagnostic session — FCA instructs the technician to disconnect the tool, drive the vehicle ~100 feet, reconnect and read All DTCs before starting any repair. It is therefore frequently a companion/secondary code rather than the fault itself. On Jeep specifically, this code is documented across 1 model.
What causes C221B on Jeep vehicles?▼
Common causes on Jeep: Fault or stored DTC in the ABS/ESC module that corrupts the BRAKE7 message, CAN bus wiring/connector fault between ABS module and DTCM, Erroneous setting during a scan-tool diagnostic session (documented FCA behavior — re-verify after driving the vehicle), Outdated DTCM software (addressed by DTCM reflash bulletins). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C221B on a Jeep?▼
Repair costs on Jeep range from $1,200 to $2,800, depending on the specific model and root cause.
Which Jeep models have C221B documented?▼
Au7o has documented C221B on 1 Jeep model: Renegade.