Code
B1202
ALFA ROMEO
B — Body
Fuel level sender circuit open
Views:
UK: 4
EN: 21
RU: 6
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring between the fuel tank sender and the instrument cluster/BCM
- Corroded, bent or loose connector at the sender or module harness
- Failed fuel level sending unit (open internal resistor)
- Blown fuse or loss of power/ground to sender circuit
- Faulty instrument cluster or body control module input circuit
- Water ingress or contamination in the sender connector or tank module
Symptoms
- Incorrect, erratic, stuck or no fuel gauge reading
- Possible dash warning light related to fuel system or instrument cluster
- Car may display incorrect range or fuel level messages
- No change in voltage/resistance when moving the fuel float (if tested)
What to check
- Read freeze frame and stored DTCs with a diagnostic scanner before clearing codes
- Visually inspect wiring and connectors at the fuel tank sender and instrument cluster/BCM for corrosion, damage or disconnection
- Check relevant fuses and power/ground circuits for the instrument cluster and tank sender
- Back-probe the sender connector and ECU/cluster connector to check continuity and signal
- Measure resistance of the sender unit (with connector disconnected) and verify it is not open
- Wiggle harness and connectors while monitoring signal for intermittent faults
Signal parameters
- Open circuit: infinite resistance (OL) between sender signal terminal and sender ground
- Typical sender behavior: variable resistance that changes smoothly as float moves (exact ohm range depends on model)
- ECU/cluster input usually sees a 0–5 V range proportional to tank level (design dependent)
- Short to ground: voltage near 0 V; short to battery: near battery voltage (~12 V)
- Expected resistance ranges vary by vehicle—consult model-specific data before replacing parts
Diagnostic algorithm
- Retrieve freeze frame and all related codes; record symptoms and any relevant history.
- Visually inspect sender connector at the tank for water, corrosion, bent pins or a disconnected plug.
- Check fuses and power/ground circuits for the instrument cluster/BCM and tank sender; repair as needed.
- With the ignition ON, back-probe the sender signal and ground at the tank connector and measure voltage; note if there is any signal (0–5 V expected on many systems).
- Disconnect the sender and measure its resistance between signal and ground while moving the float; a working sender will show a smooth, changing resistance. An open reading (infinite) indicates a bad sender.
- If sender is OK, check continuity between sender signal terminal and the cluster/BCM connector pin; repair any open circuits or high resistance.
- Inspect and repair any damaged wiring, connectors or grounds. Use dielectric grease on reassembled connectors to prevent future corrosion.
- If wiring and sender test good, test the instrument cluster/BCM input circuit for proper pull-up/pull-down behavior and replace or reprogram the module if faulty.
- Clear the code and perform a functional test (move float or refuel) and road/test-cycle to confirm repair.
Likely causes
- Open or damaged wiring/harness to the fuel level sender
- Corroded/poor connector at the sender or chassis connector
- Failed sender unit (open resistance)
- Poor ground at sender or module
Fault status
Status
Fuel level sender circuit open — the control module detects no continuity or signal from the fuel tank level sending unit. Fuel gauge and range information may be missing or incorrect.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1202
FIAT
B — Body
Fuel level sender circuit open
Views:
UK: 2
EN: 19
RU: 4
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring between the fuel tank sender and the instrument cluster/BCM
- Corroded, bent or loose connector at the sender or module harness
- Failed fuel level sending unit (open internal resistor)
- Blown fuse or loss of power/ground to sender circuit
- Faulty instrument cluster or body control module input circuit
- Water ingress or contamination in the sender connector or tank module
Symptoms
- Incorrect, erratic, stuck or no fuel gauge reading
- Possible dash warning light related to fuel system or instrument cluster
- Car may display incorrect range or fuel level messages
- No change in voltage/resistance when moving the fuel float (if tested)
What to check
- Read freeze frame and stored DTCs with a diagnostic scanner before clearing codes
- Visually inspect wiring and connectors at the fuel tank sender and instrument cluster/BCM for corrosion, damage or disconnection
- Check relevant fuses and power/ground circuits for the instrument cluster and tank sender
- Back-probe the sender connector and ECU/cluster connector to check continuity and signal
- Measure resistance of the sender unit (with connector disconnected) and verify it is not open
- Wiggle harness and connectors while monitoring signal for intermittent faults
Signal parameters
- Open circuit: infinite resistance (OL) between sender signal terminal and sender ground
- Typical sender behavior: variable resistance that changes smoothly as float moves (exact ohm range depends on model)
- ECU/cluster input usually sees a 0–5 V range proportional to tank level (design dependent)
- Short to ground: voltage near 0 V; short to battery: near battery voltage (~12 V)
- Expected resistance ranges vary by vehicle—consult model-specific data before replacing parts
Diagnostic algorithm
- Retrieve freeze frame and all related codes; record symptoms and any relevant history.
- Visually inspect sender connector at the tank for water, corrosion, bent pins or a disconnected plug.
- Check fuses and power/ground circuits for the instrument cluster/BCM and tank sender; repair as needed.
- With the ignition ON, back-probe the sender signal and ground at the tank connector and measure voltage; note if there is any signal (0–5 V expected on many systems).
- Disconnect the sender and measure its resistance between signal and ground while moving the float; a working sender will show a smooth, changing resistance. An open reading (infinite) indicates a bad sender.
- If sender is OK, check continuity between sender signal terminal and the cluster/BCM connector pin; repair any open circuits or high resistance.
- Inspect and repair any damaged wiring, connectors or grounds. Use dielectric grease on reassembled connectors to prevent future corrosion.
- If wiring and sender test good, test the instrument cluster/BCM input circuit for proper pull-up/pull-down behavior and replace or reprogram the module if faulty.
- Clear the code and perform a functional test (move float or refuel) and road/test-cycle to confirm repair.
Likely causes
- Open or damaged wiring/harness to the fuel level sender
- Corroded/poor connector at the sender or chassis connector
- Failed sender unit (open resistance)
- Poor ground at sender or module
Fault status
Status
Fuel level sender circuit open — the control module detects no continuity or signal from the fuel tank level sending unit. Fuel gauge and range information may be missing or incorrect.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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👍 Like
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0
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Code
B1202
MITSUBISHI
B — Body
Meter ECU power supply problem
Views:
UK: 7
EN: 61
RU: 13
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring between the fuel tank sender and the instrument cluster/BCM
- Corroded, bent or loose connector at the sender or module harness
- Failed fuel level sending unit (open internal resistor)
- Blown fuse or loss of power/ground to sender circuit
- Faulty instrument cluster or body control module input circuit
- Water ingress or contamination in the sender connector or tank module
Symptoms
- Incorrect, erratic, stuck or no fuel gauge reading
- Possible dash warning light related to fuel system or instrument cluster
- Car may display incorrect range or fuel level messages
- No change in voltage/resistance when moving the fuel float (if tested)
What to check
- Read freeze frame and stored DTCs with a diagnostic scanner before clearing codes
- Visually inspect wiring and connectors at the fuel tank sender and instrument cluster/BCM for corrosion, damage or disconnection
- Check relevant fuses and power/ground circuits for the instrument cluster and tank sender
- Back-probe the sender connector and ECU/cluster connector to check continuity and signal
- Measure resistance of the sender unit (with connector disconnected) and verify it is not open
- Wiggle harness and connectors while monitoring signal for intermittent faults
Signal parameters
- Open circuit: infinite resistance (OL) between sender signal terminal and sender ground
- Typical sender behavior: variable resistance that changes smoothly as float moves (exact ohm range depends on model)
- ECU/cluster input usually sees a 0–5 V range proportional to tank level (design dependent)
- Short to ground: voltage near 0 V; short to battery: near battery voltage (~12 V)
- Expected resistance ranges vary by vehicle—consult model-specific data before replacing parts
Diagnostic algorithm
- Retrieve freeze frame and all related codes; record symptoms and any relevant history.
- Visually inspect sender connector at the tank for water, corrosion, bent pins or a disconnected plug.
- Check fuses and power/ground circuits for the instrument cluster/BCM and tank sender; repair as needed.
- With the ignition ON, back-probe the sender signal and ground at the tank connector and measure voltage; note if there is any signal (0–5 V expected on many systems).
- Disconnect the sender and measure its resistance between signal and ground while moving the float; a working sender will show a smooth, changing resistance. An open reading (infinite) indicates a bad sender.
- If sender is OK, check continuity between sender signal terminal and the cluster/BCM connector pin; repair any open circuits or high resistance.
- Inspect and repair any damaged wiring, connectors or grounds. Use dielectric grease on reassembled connectors to prevent future corrosion.
- If wiring and sender test good, test the instrument cluster/BCM input circuit for proper pull-up/pull-down behavior and replace or reprogram the module if faulty.
- Clear the code and perform a functional test (move float or refuel) and road/test-cycle to confirm repair.
Likely causes
- Open or damaged wiring/harness to the fuel level sender
- Corroded/poor connector at the sender or chassis connector
- Failed sender unit (open resistance)
- Poor ground at sender or module
Fault status
Status
Fuel level sender circuit open — the control module detects no continuity or signal from the fuel tank level sending unit. Fuel gauge and range information may be missing or incorrect.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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0
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Code
B1202
Other
B — Body
Fuel Sender Circuit Open
Views:
UK: 22
EN: 114
RU: 37
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring between the fuel tank sender and the instrument cluster/BCM
- Corroded, bent or loose connector at the sender or module harness
- Failed fuel level sending unit (open internal resistor)
- Blown fuse or loss of power/ground to sender circuit
- Faulty instrument cluster or body control module input circuit
- Water ingress or contamination in the sender connector or tank module
Symptoms
- Incorrect, erratic, stuck or no fuel gauge reading
- Possible dash warning light related to fuel system or instrument cluster
- Car may display incorrect range or fuel level messages
- No change in voltage/resistance when moving the fuel float (if tested)
What to check
- Read freeze frame and stored DTCs with a diagnostic scanner before clearing codes
- Visually inspect wiring and connectors at the fuel tank sender and instrument cluster/BCM for corrosion, damage or disconnection
- Check relevant fuses and power/ground circuits for the instrument cluster and tank sender
- Back-probe the sender connector and ECU/cluster connector to check continuity and signal
- Measure resistance of the sender unit (with connector disconnected) and verify it is not open
- Wiggle harness and connectors while monitoring signal for intermittent faults
Signal parameters
- Open circuit: infinite resistance (OL) between sender signal terminal and sender ground
- Typical sender behavior: variable resistance that changes smoothly as float moves (exact ohm range depends on model)
- ECU/cluster input usually sees a 0–5 V range proportional to tank level (design dependent)
- Short to ground: voltage near 0 V; short to battery: near battery voltage (~12 V)
- Expected resistance ranges vary by vehicle—consult model-specific data before replacing parts
Diagnostic algorithm
- Retrieve freeze frame and all related codes; record symptoms and any relevant history.
- Visually inspect sender connector at the tank for water, corrosion, bent pins or a disconnected plug.
- Check fuses and power/ground circuits for the instrument cluster/BCM and tank sender; repair as needed.
- With the ignition ON, back-probe the sender signal and ground at the tank connector and measure voltage; note if there is any signal (0–5 V expected on many systems).
- Disconnect the sender and measure its resistance between signal and ground while moving the float; a working sender will show a smooth, changing resistance. An open reading (infinite) indicates a bad sender.
- If sender is OK, check continuity between sender signal terminal and the cluster/BCM connector pin; repair any open circuits or high resistance.
- Inspect and repair any damaged wiring, connectors or grounds. Use dielectric grease on reassembled connectors to prevent future corrosion.
- If wiring and sender test good, test the instrument cluster/BCM input circuit for proper pull-up/pull-down behavior and replace or reprogram the module if faulty.
- Clear the code and perform a functional test (move float or refuel) and road/test-cycle to confirm repair.
Likely causes
- Open or damaged wiring/harness to the fuel level sender
- Corroded/poor connector at the sender or chassis connector
- Failed sender unit (open resistance)
- Poor ground at sender or module
Fault status
Status
Fuel level sender circuit open — the control module detects no continuity or signal from the fuel tank level sending unit. Fuel gauge and range information may be missing or incorrect.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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