2013 Grand Caravan Won't Crank: Diagnosing a Failed TIPM

Initial Symptoms and Diagnosis

• 🚐 A 2013 Dodge Grand Caravan presents with a no-crank issue after being driven in.
• 💡 The customer reported the vehicle would not restart after shutting it off, despite a previous shop replacing the starter.
• 🔍 Initial checks revealed the starter motor itself works when jumped, but the vehicle does not crank with the key.

Scan Tool Findings and Initial Theories

• 📊 A scan tool revealed only one stored code: B212D-13, related to the ignition run only input circuit open, possibly from the airbag module.
• 🧠 The technician suspected the TIPM (Theft Integrated Power Module) or ECM (Engine Control Module) as potential culprits, as they both play a role in the cranking process.
• ⚙️ Data from the ECM indicated the ignition start switch signal was received, and a relay clicked under the hood, suggesting a temporary latching mechanism.

Investigating the TIPM and Fuses

• 🔍 The technician focused on fuses M16 and M32, which power the occupant restraint controller, as indicated by the wiring diagram.
• ⚠️ Fuse M32, the run relay, showed intermittent power loss during the cranking cycle, indicating a potential issue within the TIPM.
• 💡 A jumper wire was used to bypass the relay, and the engine successfully started and ran, confirming the starter circuit and engine are functional.

The "Russian Relay" Repair

• 🛠️ Due to the suspected TIPM failure, a temporary repair, dubbed the "Russian relay," was performed.
• ⚡ This involved soldering a wire to the missing power side of the relay's control circuit and connecting it to an alternative power source, likely from the accessory power outlet via a fuse tap.
• ⚠️ This temporary fix was implemented to get the customer back on the road quickly, as it's his only vehicle and he risks losing his job.

Conclusion and Future Steps

• ❌ The technician concluded that the TIPM is likely faulty, citing internal circuit board malfunction.
• 🚗 While the temporary repair will allow the vehicle to operate, the proper fix would involve replacing the TIPM, which may require programming or using a used module.
• 💡 The technician advises trusting data and facts, but also exercising caution with scan tools and service data, and never trusting anyone on YouTube.