🚨 Diagnostic Profile
Vehicle Make: Dodge
Description: Fuel Injection Pump Controller Always On. The fuel injection pump control circuit or module is reporting a continuous active state, which may indicate a stuck relay, shorted control circuit, failed controller, or internal pump fault. Confirm the specific model, engine, and model year before proceeding.
🚨 Repair Difficulty Tier
Tier: [Professional Only]
Diagnosis involves high-pressure fuel system components, live electrical circuits, and possible control module programming. Improper handling of fuel system pressure or electrical faults can cause fire, injury, or engine damage.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
- Verify battery state of charge (minimum 12.4V resting) and inspect battery terminals and main engine/chassis ground straps for corrosion or looseness.
- Inspect the Totally Integrated Power Module (TIPM) or underhood fuse/relay center for the fuel pump relay and injection pump control relay; check for blown fuses, carbon tracking, or relays stuck closed due to welded contacts.
- Visually inspect wiring harness near the fuel injection pump, high-pressure pump controller, and TIPM for chafing, melted insulation, rodent damage, or pinched routing near the engine block or frame rail.
- Inspect connector pins at the pump controller and TIPM for corrosion, spread terminals, or backed-out pins; look for green corrosion buildup typical of moisture intrusion at bulkhead connectors.
- Retrieve all active and pending diagnostic trouble codes and freeze frame data using a factory-level scan tool (e.g., StarSCAN or wiTECH for Dodge/Chrysler platforms). Record all codes, including any related P0088, P0191, or fuel rail pressure codes before clearing.
- Confirm whether the fuel pump or injection pump controller remains energized (audible hum/relay click) with the ignition off and key removed. Note any continuous relay click-and-hold condition or excessive current draw from the affected circuit.
Step 2: Diagnostic Verification
- Measure control circuit voltage at the controller/relay connector with the key on, engine off (KOEO) using a digital multimeter: confirm switched voltage matches battery reference voltage (approximately 12V) only when commanded, not continuously.
- Perform a parasitic current draw test on the affected circuit with the key off using an inductive or in-line ammeter: total vehicle parasitic draw should typically stabilize below 50 milliamps after all modules enter sleep mode (allow 20-40 minutes for modules to time out).
- Check control circuit continuity to ground and to voltage supply using a multimeter in continuity/resistance mode to identify shorts-to-ground or shorts-to-power; compare readings against a known-good ground point on the engine block.
- Verify controller ground integrity using a voltage drop test under load (engine running or relay energized): voltage drop across any ground circuit should not exceed 0.2V between the controller ground pin and chassis ground.
- Use a scan tool bi-directional control test or oscilloscope to confirm the PCM/ECM commanded state of the fuel pump/injection pump relay driver matches actual relay/pump actuation; look for a driver circuit stuck low (commanding ground continuously) as the root cause of an “always on” condition.
- Isolate the fault by disconnecting the controller/relay and retesting the control circuit in isolation to determine whether the fault lies in the PCM driver circuit, the harness, or the relay/controller itself.
- If equipped with a separate fuel injection pump control module (common pressure rail diesel systems), test the internal control solenoid resistance using a multimeter and compare to OEM factory service manual specification for that specific engine (values vary significantly by engine family, so confirm using the vehicle’s official FSM before condemning the part).
Step 3: Resolution & Reset Process
- Repair any identified harness damage, corrosion, or short circuit using OEM-approved solder-and-heat-shrink splices or weather-pack terminals rated for underhood automotive use. Document the exact location of the repair (e.g., harness section between the TIPM and engine harness connector, or at the pump controller pigtail).
- Replace the faulty relay, fuse, or fuel injection pump control module only after testing confirms failure rather than a wiring fault. Cross-reference the OEM part number using the vehicle’s VIN to ensure correct application, as relay and controller part numbers vary by engine and model year.
- Fully depressurize the high-pressure fuel system per the manufacturer’s documented procedure before disconnecting any fuel line, injector, or pump component. Use a fuel pressure gauge to confirm zero residual pressure before line disconnection.
- If a controller, PCM, or pump is replaced, perform the required module programming, VIN relearn, or injector coding procedure using a factory-level scan tool capable of Dodge/Chrysler programming (wiTECH 2.0 or equivalent dealer-level software with current subscription).
- Clear all diagnostic trouble codes and perform a complete drive cycle, including idle, part-throttle, and highway speed conditions, to confirm the fault does not return and no new codes are generated.
- Recheck the parasitic draw after repair with the key off to confirm the controller and relay de-energize normally; current draw should drop below the vehicle’s specified sleep-mode threshold (typically under 50 milliamps) within the normal module shutdown window.
📦 Parts, Labor, and Budget Estimates
Required Components/Software:
- Fuel injection pump relay or control relay (TIPM-integrated or stand-alone, confirm by VIN)
- Fuel injection pump control module/driver (diesel common-rail applications only, confirm by engine and VIN)
- Wiring harness repair kit: weather-pack terminals, marine-grade heat shrink splices, dielectric grease
- Factory scan tool access: wiTECH 2.0 subscription or equivalent dealer-level diagnostic/programming software
Average Component Price:
- Fuel pump/injection relay: $15–$60
- TIPM (if integrated relay circuit is at fault and TIPM must be replaced): $400–$900 (part only, varies widely by model year)
- Fuel injection pump control module (diesel applications): $350–$1,200 depending on engine platform
- High-pressure fuel injection pump (only if internally failed): $600–$2,000+ depending on engine (gas direct injection vs. diesel common-rail)
- Harness repair materials: $20–$75
- Programming/dealer software session fee: $100–$250 per session (independent shops with subscription access) or $150–$350 (dealer flat programming fee)
Estimated Labor Hours (Shop Book Reference):
- Diagnosis and electrical verification (relay, circuit, ground, and driver testing): 1.0–2.5 hours
- Relay or TIPM replacement: 0.5–2.0 hours (TIPM replacement is more labor-intensive due to connector count and relearns)
- Fuel injection pump or control module replacement: 2.0–6.0 hours depending on engine accessibility and whether fuel system depressurization/bleeding is required
- Programming, relearn, and post-repair verification: 0.5–1.5 hours
- Total estimated labor range: 2.0–8.5 hours depending on root cause and components replaced