Fix U0212: Mechanic’s solutions that WORKED

The code U0212: Lost Communication with Steering Column Control Module points out a fault in communication with the Steering Column Control Module, which is essential for various steering functions and potentially other related systems. It is likely caused by issues in the network communication lines, module failure, or power supply problems.

U0212 quick overview

Meaning	U0212: Lost Communication with Steering Column Control Module
Is it serious?	Yes, this code is serious as it can affect the vehicle’s steering functions and other related systems, potentially compromising safety.
Possible causes	– Damaged or corroded wiring and connectors – Faulty Steering Column Control Module – Issues with the vehicle’s CAN (Controller Area Network) bus – Low battery voltage or bad ground connections
How to diagnose?	Check Wiring and Connectors: Inspect the wiring and connectors related to the Steering Column Control Module for damage or corrosion. Monitor CAN Bus: Use a diagnostic scanner or oscilloscope to check the CAN Bus signals for disruptions or irregularities. Inspect Ground Connections: Ensure all ground points related to the module and network are clean and secure. Module Testing: Test the Steering Column Control Module itself for faults or consider swapping with a known good unit if possible. Battery and Power Check: Verify the battery is in good health and all power connections are secure.

How to fix U0212 – learn from mechanics

I looked into U0212 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Saab

Vehicle Information: 2006 Saab 9-3 Aero 2.8L

Issue + Repair History:

• Vehicle initially had an intermittent no crank issue with no codes.
• Replaced battery disconnect switch, but problem returned.
• Multiple modules reported missing on bus codes (U2100, U0212), with an expanding list of codes on each visit.
• Replaced multiple components on the P-bus, including CIM, ICM, ISM, and ESP/ABS module.

Other OBD2 Codes + Test Results:

• Consistent codes: ECM – U0122, p0318, U0212, TCM – U0002, U0212, U0121, ESP+ – U2142, U2143, U2103, U2106, U2105, CIM – U2100.
• Charging system and battery tests were good.

What are people suggesting to fix the issue:

• Disconnect the battery for 15 minutes to fully discharge electronics.
• Inspect ESP/ABS ECM for intermittent component missing from the P bus.
• Replace the ISM (ignition switch module) and inspect wiring on the P-bus.
• Troubleshoot the LAN and inspect the instrument cluster connector for issues.
• Replace the ESP/TCS module.

What was the final fix:

• Found moving the TC/ESP (ABS) module harness side-to-side caused communication issues.
• Replaced terminals #1&2 and #13&14 at the TC/ESP connector which resolved the problem.

Case #2: Dodge

Vehicle Information: 2016 Dodge Ram 1500 5.7L

Issue + Repair History:

• Intermittent MIL illumination while driving, accompanied by flashing traction/ABS lamp, and automatic activation of wipers.
• Issue reoccurs after hitting bumps.
• Checked connectors under the steering column and fuses without finding any faults.

Other OBD2 Codes + Test Results:

• U0212: Lost communication
• U0416: Invalid communication

What are people suggesting to fix the issue:

• Consider that wipers may come on due to loss of communication with their network as a failsafe.
• Check the 26 pin and 43 pin connector on the driver’s side lower part of the instrument panel for CAN communication issues.
• Inspect the wiring and connectors in and around the steering column for damage or connection issues, particularly to the Steering Column Module.

What was the final fix:

• Found a damaged pin in the larger connector at the base of the column. Repairing the pin resolved the issue.

Case #3: Jeep

Vehicle Information: 2014 Jeep Grand Cherokee Limited 3.6L

Issue + Repair History:

• Intermittent no crank issue; MIL and various lamps on, wipers turn on automatically.
• Multiple CAN communication failure codes (U0100, U0121, U0102, U0103, U0212, U0140).
• Replaced battery, terminals tightened, BCM flashed.
• TSB for BCM flash for communication issues applied.

Other OBD2 Codes + Test Results:

• U0100 (ECM CAN failure)
• U0121 (ABS CAN Failure)
• U0102 (DTCM Can Failure)
• U0103 (AGSM Can Failure)
• U0212 (SCM Can Failure)
• U0140 (BCM Can Failure)

Suggestions to Fix Issue:

• Check B+ connections between battery and fuse box.
• Ensure PCM connectors are fully seated.
• Disconnect modules with communication codes and check wires at the star connector.
• Consider temperature effect on ECM and check for wiring issues.
• Use a scope to monitor CAN + and CAN – Bus signals.

Final Fix:

• Accessed the star connector, monitored the CAN signal, disconnected CAN lines for TCM, SCM, and ABS, checked for resistance and signal.
• Replaced broken ground strap near the alternator.
• Suspected contact issue at TCM; after multiple tests and drives, no more CEL, issue resolved.

Case #4: Ford

Vehicle Information: 2015 Ford F-250 Super Duty XL 6.2L

Issue + Repair History:

• Customer experienced loss of all dash lights, vehicle power died, no restart; towed to the shop.
• Vehicle intermittently starts and runs well; experienced a one-time no-start, no crank.
• No codes in PCM and TCM, only CAN codes in the Antilock module.
• Previous repair months ago for all cluster lights illuminating randomly.

Other OBD2 Codes + Test Results:

• U codes in Antilock: U0140, U0156, U0102, U0212, U0151, U0137.

Suggestions to Fix Issue:

• Inspect wiring harness over the parking brake for issues with CAN wiring.
• Apply a contact enhancer to connectors or bypass high-speed CAN comm wires through bulk connector above the parking brake pedal.
• Perform a thorough check on the vehicle’s grounds.

Final Fix:

• Inspected, cleaned, adjusted, and added dielectric grease to all connectors under the dash, and at the ABS module.
• Rerouted the connector at the E-brake area and secured others.
• Retested, could not duplicate the issue; the vehicle left and has not returned with the same problem.

Case #5: Saab

Vehicle Information: 2006 Saab 9-3 Aero 2.8L

Issue + Repair History:

• Intermittent no crank issue with various CAN communication codes (ADM u1601, TCM u0212, ESP+ u2139, u2142, u2143).
• Clearing codes sometimes allows the vehicle to start; bizarrely, turning on fog lights also occasionally enables starting.
• Problem suspected to be related to the ESP module affecting the P-BUS.

Other OBD2 Codes + Test Results:

• ADM u1601
• TCM u0212
• ESP+ u2139, u2142, u2143

Suggestions to Fix Issue:

• Suggestion to manipulate the ESP/ABS module connector while monitoring the bus data to observe any changes.
• Considering removing the ESP module connector and jumping the P-Bus wires to diagnose if the ESP module is the issue.

Final Fix:

• Confirmed the ESP/ABS module was the problem after manipulating the plug on the module and observing changes in bus data.
• Had the ESP/ABS module rebuilt, which resolved the starting issue.

Advice	Brief Description of Diagnostic Step
Check Wiring and Connections	Inspect the wiring and connectors related to the modules reporting communication failures, especially near areas prone to physical damage or wear.
Inspect Ground Connections	Ensure all ground connections are secure and clean, as poor grounding can lead to communication issues.
Monitor CAN Bus	Use a scope or suitable diagnostic tool to monitor the CAN Bus signals for irregularities or interruptions.
Module Isolation	Disconnect suspect modules one at a time to isolate the source of the communication failure. Pay special attention to the module most frequently indicated in the U0212 code context.
Check for TSBs and Recalls	Always check for any Technical Service Bulletins or recalls that might address widespread issues related to communication faults in specific models.
Battery and Power Supply Check	Ensure the battery is in good condition and all B+ connections are secure, as low voltage can cause erratic communication issues.
Update/Reflash Modules	If applicable, update or reflash the modules’ firmware as outdated software can lead to communication errors.