Code
B1204
ALFA ROMEO
B — Body
Fuel level sender circuit short to ground
Views:
UK: 6
EN: 13
RU: 13
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness causing signal to short to chassis ground
- Corroded or bent connector pins at the fuel level sender or instrument cluster
- Failed fuel level sender (resistor/float assembly) with internal short
- Water/contaminants in the fuel tank connector or harness
- Faulty instrument cluster or body control module input circuit
- Aftermarket equipment or recent repair that disturbed wiring (poor routing/grounding)
Symptoms
- Fuel gauge reads empty or full and does not change with fuel level
- Erratic or jumping fuel level gauge
- Fuel level warning lamp may be on or illuminate incorrectly
- DTC B1204 stored in body/comfort module or instrument cluster memory
- Possible loss of sender signal in live data from scan tool
What to check
- Scan vehicle and record freeze frame, related fuel level live data and other stored codes
- Visually inspect fuel tank area, fuel pump module connector and chassis near harness routing for damage/corrosion
- Backprobe the fuel sender connector with key on (engine off) and measure signal voltage vs ground
- Check for continuity between sender signal wire and ground with connector disconnected (should not be continuity/short)
- Measure resistance of the sender assembly on bench (disconnect harness) and compare to specification in factory data
- Wiggle wiring while monitoring live data to reproduce intermittent short
Signal parameters
- Reference voltage typically provided by cluster/ECU: ~5 V (check OEM spec)
- Sender signal voltage expected to vary between ~0–5 V according to fuel level (model dependent)
- Sender resistance varies by model — consult factory repair data (do not rely on generic values)
- Short-to-ground symptom: signal voltage measured at harness will be near 0 V or show continuity to chassis ground
Diagnostic algorithm
- Read and record DTCs and live fuel level signal with a scan tool; note any related codes. 2) Visually inspect wiring harness routing from instrument cluster/body module to fuel pump module for chafing, pinching, or recent repairs. 3) With ignition ON (engine OFF) backprobe the fuel sender signal pin at the tank connector and measure voltage; if ≈0 V suspect a short to ground. 4) Disconnect the sender connector and measure continuity between the signal wire and chassis ground; continuity indicates a short in the harness. 5) If no short to ground at harness, bench test the sender resistance/voltage per factory procedure; replace if internal short or out of spec. 6) If harness is shorted, trace damaged section by isolating segments (disconnect intermediate connectors) and using an ohmmeter to find where continuity to ground appears. Repair or replace wiring and connectors as needed. 7) After repair, clear codes and verify proper gauge operation with scan tool and test drive; confirm code does not return. 8) If wiring and sender test good but issue persists, test instrument cluster/body control module input for internal short or consult module diagnostics/reprogramming procedures.
Likely causes
- Wire insulation rubbed through where it passes near chassis or suspension components leading to intermittent short on signal wire
- Connector terminal corrosion allowing the signal to be shorted to ground at pump module
- Fuel sender internal failure (shorted winding or sensor element) causing the sender output to be near ground potential
- Connector pin inserted into wrong cavity or pushed out during service, contacting ground
Fault status
Status
B1204 — Fuel level sender circuit short to ground (signal pulled to chassis ground)
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1204
FIAT
B — Body
Fuel level sender circuit short to ground
Views:
UK: 3
EN: 7
RU: 9
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness causing signal to short to chassis ground
- Corroded or bent connector pins at the fuel level sender or instrument cluster
- Failed fuel level sender (resistor/float assembly) with internal short
- Water/contaminants in the fuel tank connector or harness
- Faulty instrument cluster or body control module input circuit
- Aftermarket equipment or recent repair that disturbed wiring (poor routing/grounding)
Symptoms
- Fuel gauge reads empty or full and does not change with fuel level
- Erratic or jumping fuel level gauge
- Fuel level warning lamp may be on or illuminate incorrectly
- DTC B1204 stored in body/comfort module or instrument cluster memory
- Possible loss of sender signal in live data from scan tool
What to check
- Scan vehicle and record freeze frame, related fuel level live data and other stored codes
- Visually inspect fuel tank area, fuel pump module connector and chassis near harness routing for damage/corrosion
- Backprobe the fuel sender connector with key on (engine off) and measure signal voltage vs ground
- Check for continuity between sender signal wire and ground with connector disconnected (should not be continuity/short)
- Measure resistance of the sender assembly on bench (disconnect harness) and compare to specification in factory data
- Wiggle wiring while monitoring live data to reproduce intermittent short
Signal parameters
- Reference voltage typically provided by cluster/ECU: ~5 V (check OEM spec)
- Sender signal voltage expected to vary between ~0–5 V according to fuel level (model dependent)
- Sender resistance varies by model — consult factory repair data (do not rely on generic values)
- Short-to-ground symptom: signal voltage measured at harness will be near 0 V or show continuity to chassis ground
Diagnostic algorithm
- Read and record DTCs and live fuel level signal with a scan tool; note any related codes. 2) Visually inspect wiring harness routing from instrument cluster/body module to fuel pump module for chafing, pinching, or recent repairs. 3) With ignition ON (engine OFF) backprobe the fuel sender signal pin at the tank connector and measure voltage; if ≈0 V suspect a short to ground. 4) Disconnect the sender connector and measure continuity between the signal wire and chassis ground; continuity indicates a short in the harness. 5) If no short to ground at harness, bench test the sender resistance/voltage per factory procedure; replace if internal short or out of spec. 6) If harness is shorted, trace damaged section by isolating segments (disconnect intermediate connectors) and using an ohmmeter to find where continuity to ground appears. Repair or replace wiring and connectors as needed. 7) After repair, clear codes and verify proper gauge operation with scan tool and test drive; confirm code does not return. 8) If wiring and sender test good but issue persists, test instrument cluster/body control module input for internal short or consult module diagnostics/reprogramming procedures.
Likely causes
- Wire insulation rubbed through where it passes near chassis or suspension components leading to intermittent short on signal wire
- Connector terminal corrosion allowing the signal to be shorted to ground at pump module
- Fuel sender internal failure (shorted winding or sensor element) causing the sender output to be near ground potential
- Connector pin inserted into wrong cavity or pushed out during service, contacting ground
Fault status
Status
B1204 — Fuel level sender circuit short to ground (signal pulled to chassis ground)
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1204
LAND ROVER
B — Body
Fuel sensor short to ground - low resistance
Views:
UK: 4
EN: 11
RU: 8
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness causing signal to short to chassis ground
- Corroded or bent connector pins at the fuel level sender or instrument cluster
- Failed fuel level sender (resistor/float assembly) with internal short
- Water/contaminants in the fuel tank connector or harness
- Faulty instrument cluster or body control module input circuit
- Aftermarket equipment or recent repair that disturbed wiring (poor routing/grounding)
Symptoms
- Fuel gauge reads empty or full and does not change with fuel level
- Erratic or jumping fuel level gauge
- Fuel level warning lamp may be on or illuminate incorrectly
- DTC B1204 stored in body/comfort module or instrument cluster memory
- Possible loss of sender signal in live data from scan tool
What to check
- Scan vehicle and record freeze frame, related fuel level live data and other stored codes
- Visually inspect fuel tank area, fuel pump module connector and chassis near harness routing for damage/corrosion
- Backprobe the fuel sender connector with key on (engine off) and measure signal voltage vs ground
- Check for continuity between sender signal wire and ground with connector disconnected (should not be continuity/short)
- Measure resistance of the sender assembly on bench (disconnect harness) and compare to specification in factory data
- Wiggle wiring while monitoring live data to reproduce intermittent short
Signal parameters
- Reference voltage typically provided by cluster/ECU: ~5 V (check OEM spec)
- Sender signal voltage expected to vary between ~0–5 V according to fuel level (model dependent)
- Sender resistance varies by model — consult factory repair data (do not rely on generic values)
- Short-to-ground symptom: signal voltage measured at harness will be near 0 V or show continuity to chassis ground
Diagnostic algorithm
- Read and record DTCs and live fuel level signal with a scan tool; note any related codes. 2) Visually inspect wiring harness routing from instrument cluster/body module to fuel pump module for chafing, pinching, or recent repairs. 3) With ignition ON (engine OFF) backprobe the fuel sender signal pin at the tank connector and measure voltage; if ≈0 V suspect a short to ground. 4) Disconnect the sender connector and measure continuity between the signal wire and chassis ground; continuity indicates a short in the harness. 5) If no short to ground at harness, bench test the sender resistance/voltage per factory procedure; replace if internal short or out of spec. 6) If harness is shorted, trace damaged section by isolating segments (disconnect intermediate connectors) and using an ohmmeter to find where continuity to ground appears. Repair or replace wiring and connectors as needed. 7) After repair, clear codes and verify proper gauge operation with scan tool and test drive; confirm code does not return. 8) If wiring and sender test good but issue persists, test instrument cluster/body control module input for internal short or consult module diagnostics/reprogramming procedures.
Likely causes
- Wire insulation rubbed through where it passes near chassis or suspension components leading to intermittent short on signal wire
- Connector terminal corrosion allowing the signal to be shorted to ground at pump module
- Fuel sender internal failure (shorted winding or sensor element) causing the sender output to be near ground potential
- Connector pin inserted into wrong cavity or pushed out during service, contacting ground
Fault status
Status
B1204 — Fuel level sender circuit short to ground (signal pulled to chassis ground)
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1204
MITSUBISHI
B — Body
PS.ABG indicator circuit low
Views:
UK: 5
EN: 12
RU: 10
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness causing signal to short to chassis ground
- Corroded or bent connector pins at the fuel level sender or instrument cluster
- Failed fuel level sender (resistor/float assembly) with internal short
- Water/contaminants in the fuel tank connector or harness
- Faulty instrument cluster or body control module input circuit
- Aftermarket equipment or recent repair that disturbed wiring (poor routing/grounding)
Symptoms
- Fuel gauge reads empty or full and does not change with fuel level
- Erratic or jumping fuel level gauge
- Fuel level warning lamp may be on or illuminate incorrectly
- DTC B1204 stored in body/comfort module or instrument cluster memory
- Possible loss of sender signal in live data from scan tool
What to check
- Scan vehicle and record freeze frame, related fuel level live data and other stored codes
- Visually inspect fuel tank area, fuel pump module connector and chassis near harness routing for damage/corrosion
- Backprobe the fuel sender connector with key on (engine off) and measure signal voltage vs ground
- Check for continuity between sender signal wire and ground with connector disconnected (should not be continuity/short)
- Measure resistance of the sender assembly on bench (disconnect harness) and compare to specification in factory data
- Wiggle wiring while monitoring live data to reproduce intermittent short
Signal parameters
- Reference voltage typically provided by cluster/ECU: ~5 V (check OEM spec)
- Sender signal voltage expected to vary between ~0–5 V according to fuel level (model dependent)
- Sender resistance varies by model — consult factory repair data (do not rely on generic values)
- Short-to-ground symptom: signal voltage measured at harness will be near 0 V or show continuity to chassis ground
Diagnostic algorithm
- Read and record DTCs and live fuel level signal with a scan tool; note any related codes. 2) Visually inspect wiring harness routing from instrument cluster/body module to fuel pump module for chafing, pinching, or recent repairs. 3) With ignition ON (engine OFF) backprobe the fuel sender signal pin at the tank connector and measure voltage; if ≈0 V suspect a short to ground. 4) Disconnect the sender connector and measure continuity between the signal wire and chassis ground; continuity indicates a short in the harness. 5) If no short to ground at harness, bench test the sender resistance/voltage per factory procedure; replace if internal short or out of spec. 6) If harness is shorted, trace damaged section by isolating segments (disconnect intermediate connectors) and using an ohmmeter to find where continuity to ground appears. Repair or replace wiring and connectors as needed. 7) After repair, clear codes and verify proper gauge operation with scan tool and test drive; confirm code does not return. 8) If wiring and sender test good but issue persists, test instrument cluster/body control module input for internal short or consult module diagnostics/reprogramming procedures.
Likely causes
- Wire insulation rubbed through where it passes near chassis or suspension components leading to intermittent short on signal wire
- Connector terminal corrosion allowing the signal to be shorted to ground at pump module
- Fuel sender internal failure (shorted winding or sensor element) causing the sender output to be near ground potential
- Connector pin inserted into wrong cavity or pushed out during service, contacting ground
Fault status
Status
B1204 — Fuel level sender circuit short to ground (signal pulled to chassis ground)
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1204
Other
B — Body
Fuel Sender Circuit Short To Ground
Views:
UK: 17
EN: 38
RU: 26
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness causing signal to short to chassis ground
- Corroded or bent connector pins at the fuel level sender or instrument cluster
- Failed fuel level sender (resistor/float assembly) with internal short
- Water/contaminants in the fuel tank connector or harness
- Faulty instrument cluster or body control module input circuit
- Aftermarket equipment or recent repair that disturbed wiring (poor routing/grounding)
Symptoms
- Fuel gauge reads empty or full and does not change with fuel level
- Erratic or jumping fuel level gauge
- Fuel level warning lamp may be on or illuminate incorrectly
- DTC B1204 stored in body/comfort module or instrument cluster memory
- Possible loss of sender signal in live data from scan tool
What to check
- Scan vehicle and record freeze frame, related fuel level live data and other stored codes
- Visually inspect fuel tank area, fuel pump module connector and chassis near harness routing for damage/corrosion
- Backprobe the fuel sender connector with key on (engine off) and measure signal voltage vs ground
- Check for continuity between sender signal wire and ground with connector disconnected (should not be continuity/short)
- Measure resistance of the sender assembly on bench (disconnect harness) and compare to specification in factory data
- Wiggle wiring while monitoring live data to reproduce intermittent short
Signal parameters
- Reference voltage typically provided by cluster/ECU: ~5 V (check OEM spec)
- Sender signal voltage expected to vary between ~0–5 V according to fuel level (model dependent)
- Sender resistance varies by model — consult factory repair data (do not rely on generic values)
- Short-to-ground symptom: signal voltage measured at harness will be near 0 V or show continuity to chassis ground
Diagnostic algorithm
- Read and record DTCs and live fuel level signal with a scan tool; note any related codes. 2) Visually inspect wiring harness routing from instrument cluster/body module to fuel pump module for chafing, pinching, or recent repairs. 3) With ignition ON (engine OFF) backprobe the fuel sender signal pin at the tank connector and measure voltage; if ≈0 V suspect a short to ground. 4) Disconnect the sender connector and measure continuity between the signal wire and chassis ground; continuity indicates a short in the harness. 5) If no short to ground at harness, bench test the sender resistance/voltage per factory procedure; replace if internal short or out of spec. 6) If harness is shorted, trace damaged section by isolating segments (disconnect intermediate connectors) and using an ohmmeter to find where continuity to ground appears. Repair or replace wiring and connectors as needed. 7) After repair, clear codes and verify proper gauge operation with scan tool and test drive; confirm code does not return. 8) If wiring and sender test good but issue persists, test instrument cluster/body control module input for internal short or consult module diagnostics/reprogramming procedures.
Likely causes
- Wire insulation rubbed through where it passes near chassis or suspension components leading to intermittent short on signal wire
- Connector terminal corrosion allowing the signal to be shorted to ground at pump module
- Fuel sender internal failure (shorted winding or sensor element) causing the sender output to be near ground potential
- Connector pin inserted into wrong cavity or pushed out during service, contacting ground
Fault status
Status
B1204 — Fuel level sender circuit short to ground (signal pulled to chassis ground)
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
Send to email