Traction Control & Brake Warnings? The Surprising Culprit Behind This 2016 Dodge Durango’s Chaos
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Today’s customer came in with their 2016 Dodge Durango. The Traction Control light and Service Brake system warning message were lit on the dashboard; something strange was going on with this SUV.
Diagnosis
Using my SnapOn Apollo D9 scanner to read codes, I found a few codes present in the engine control module (ECM) and anti-lock braking system (ABS) module that could point to what the issue might be. Most notably, the code U0401, “Vacuum Pump not communicating,” was present in both modules.
I opened Identifix to search for a wiring diagram to test for ground and power at the pump. I did not find power at the pump when I tested it with the scanner, but the fuse related to that module tested good. Using the Power Probe, I tested the relay for the pump circuit and found that the relay was good. Referring back to the wiring diagram, I located the circuit connector ends and tested for continuity with the SnapOn Multimeter EEDM503D.
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There was no continuity from Pump to ECM on the power side of the circuit, so I tested the continuity from Relay to Pump and found the circuit was good. Next, I tested continuity from the Relay to the ECM and found none. I then removed the TIPM (Totally Integrated Power Module) from its bracket to inspect the connector for proper connection and retested continuity from the Relay to the ECM, but still found none.
I added a fused test circuit and cut the old circuit from the Relay to the ECM. After connecting the Pump and ECM, I reinstalled the Relay and tested the circuit to confirm communication to the Pump.
The Fix
I connected a fused circuit of my own that would link the ECM to the Relay. By adding a fused circuit directly from the Relay to the ECM, you eliminate the multiple connections and potential connection breaks in the circuit. By adding a fused circuit, you protect the ECM from any unwanted power surge from the Relay should it ever go bad. A quick test-drive confirmed that adding an additional circuit was just what this car needed! The warning lights did not return on the dash, and those strange fault codes didn’t return.
Bonus Tip
The TIPM on all of the Dodge/Chrysler vehicles is a problem area. Most communication and circuit issues stem from that module. A good place to start your diagnosis is checking the connections on the TIPM for corrosion or broken circuits at the connector. Identifix helps, too.
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