2018 GMC Savana 2500
Mileage
94,931
Service Date
3/18/2025
Services Performed
- Code Scan: -Engine P069E
- Fuel Pump Control Module Requested MIL Illumination (Symptom 00) – Current DTC, Test Failed Since DTC Clear, History DTC, Test Not Passed Since Power Up, Current DTC Since Power Up. -Airbag B0085
- Left Front Side Impact Sensor Short To Battery Or Open (Symptom 05) – History DTC. B0086
- Right Front Side Impact Sensor Short To Battery Or Open (Symptom 05) – History DTC. -Chassis Control Module P2534
- Ignition On/Start Switch Circuit Low Voltage (Symptom 00) -Current DTC, Test Failed Since DTC Clear, History DTC, Test Not Passed Since Power Up, Current DTC Since Power Up, Warning Indicator Requested. -Theft Deterrent U0020
- Low Speed CAN Bus (Symptom 00) – Current DTC, Test Not Passed Since DTC Cleared, Test Failed Since DTC Clear, History DTC, Test Not Passed Since Power Up, Warning Indicator Requested. U0155
- Lost Communication with Instrument Cluster (Symptom 00) – Test Failed Since DTC Clear, History DTC, Warning Indicator Requested. OBDII Codes ($03) P069E
- Fuel Pump Control Module Requested MIL Illumination P2534
- Ignition Switch On/Start Position Circuit Low MIL is on due to FPCM faults. Chassis Control Module is the controller for the fuel pump, and drives pump directly. CCM data shows zero volts on IGN parameter. Inspect the 10A FSCM IGN fuse in the engine compartment which feeds this circuit and found a wire wrapped around the fuse blade on the "load" side of the terminal and the fuse is blown. This wire leads off into the interior though the firewall and has an inline fuse rated at 15A. Found this wire leads to some type of tracking/GPS unit that in haphazardly installed in the center console box with multiple lengths of speaker wire and poor crimps. Having an accessory wire tapped into the load side of a fuse is generally a poor idea then having a fuse in line with a HIGHER rating of the tapped fuse is an even worse idea, but by far the poorest choice was simply wrapping the bare wire around the fuse leg. This all lead to the blowing of the fuse that powers the FPCM and caused code. While looking under the dash to find out where wire leads to, the doors kept locking and unlocking as wires were moved around as well as random alarm going off. There is a whole bunch of poorly installed aftermarket devices such as the alarm which has loose taps and one wire spliced into the OBDII connector that has just been stripped and twisted and it clearly loose as well as just left bare. Additional aftermarket GPS units tapped into OBD plug and adapter and wrapped around alarm wiring and hanging down into driver foot area. All of this should be cleaned up and installed correctly with proper connections and secured well to avoid obstructing driver. Right now with new fuse installed and suspect wire removed the FPCM is normal.
- Pull new switched power and constant power from left kick panel area instead of the ignition switch harness which is a very low rated circuit at 2A. Hard-wire the hidden GPS unit that is under the left side of dash and run new power and ground circuit to the unit in the center console box, leaving a courtesy loop in case it needs to be moved. Fuses for these units are located behind the left kick panel. Also pulled new circuits for the alarm using existing fuses and generally clean up the wire routing and supply good ground, existing one was loose. Bundle up remaining wire for two OBDII powered GPS units and tuck units up out of the way under the left side of knee bolster.
Geline gave our service a 5 star review on 4/7/2025
