Code
C1241
Generic
C — Chassis
ABS Hydraulic Pressure Differential Switch Input Short Circuit To Ground
Views:
UK: 22
EN: 26
RU: 22
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with insulation rubbed through and contacting chassis ground
- Corroded, bent or pushed‑out connector pins at the pressure differential switch or module
- Failed pressure differential switch (internal short)
- Water intrusion or contamination in connector or switch
- Poor or missing ground or fault in ABS control module input circuitry
Symptoms
- ABS warning lamp illuminated
- Traction control / stability control warning (ESC, DSC, TCS) may also illuminate
- Loss or reduction of ABS/traction control functionality
- Brake system messages or reduced braking assistance on some vehicles
- Codes may be intermittent and return after road vibration or moisture exposure
What to check
- Read freeze frame and pending codes with a capable scan tool; record status and conditions
- Visually inspect wiring and connector for the pressure differential switch for corrosion, damage or pin distortion
- Check for water, grease or debris in the connector; look for repair splice points or areas prone to chafe
- With ignition ON (engine off), backprobe the switch signal wire and measure voltage; look for ~reference voltage (pull‑up) or 0 V depending on switch state
- Check continuity from the switch signal pin to chassis ground (should not be continuous unless switch is designed to ground when activated)
- Perform a wiggle test on harness while monitoring the signal and checking for code recurrence
Signal parameters
- Typical signal type: single switched/logic input (closed to ground when actuated or open with pull‑up to module reference voltage)
- Expected voltage when switch is open (inactive): approximately module pull‑up voltage (commonly ~4–5 V)
- Expected voltage when switch is closed (active): approximately 0 V (grounded)
- Short‑to‑ground condition: signal measures ~0 V continuously regardless of hydraulic state
- Open‑circuit condition: signal may float near pull‑up voltage or show high resistance
Diagnostic algorithm
- Connect a scan tool and confirm C1241 and any related codes; note freeze frame and clear codes to see if code returns.
- Visually inspect the wiring and connector at the hydraulic pressure differential switch and along the harness to the ABS module. Repair obvious damage.
- With the connector disconnected, check continuity from the switch signal pin to chassis ground. If continuity exists when the switch is not actuated, suspect a short in the wiring or internal short in the switch.
- Reconnect connector. With ignition ON, backprobe the signal wire and measure voltage. Compare to expected pull‑up (~4–5 V) and check for 0 V when switch should be active. Wiggle harness and operate brakes (or cycle pressure per service manual) to reproduce fault.
- If signal is always at or near 0 V, isolate by disconnecting the switch and measuring at the module connector. If the module input still reads 0 V with the switch disconnected, the short is in wiring or module side; if it reads pull‑up voltage, the switch is shorted—replace the switch.
- Repair any found wiring damage, repair/replace corroded connectors or pigtail, and secure harness away from moving parts. Replace the pressure differential switch if its internal circuit is faulty.
- If wiring and switch test good but code persists, check module grounds and perform module connector inspection; consider testing or replacing ABS control module if internal input circuit is damaged.
- After repairs, clear codes and perform a road test to confirm the code does not return and ABS/ESC function is restored.
Likely causes
- Wiring short to chassis ground near the brake lines, caliper, wheel area or ABS modulator
- Faulty or damaged pressure differential switch
- Corroded connector at the switch (moisture ingress)
- Loose or corroded ground(s) at chassis or ABS module
- Intermittent internal failure in ABS/ESP control module (less common)
Fault status
Status
ABS hydraulic pressure differential switch input detected short to ground. ABS/ESC functions may be disabled. Further diagnosis required to identify wiring, connector, sensor or module fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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2
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6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
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Workshop ManualYour experience will help others
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Code
C1241
HUMMER
C — Chassis
Variable Effort Steering Circuit Malfunction
Views:
UK: 8
EN: 16
RU: 13
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with insulation rubbed through and contacting chassis ground
- Corroded, bent or pushed‑out connector pins at the pressure differential switch or module
- Failed pressure differential switch (internal short)
- Water intrusion or contamination in connector or switch
- Poor or missing ground or fault in ABS control module input circuitry
Symptoms
- ABS warning lamp illuminated
- Traction control / stability control warning (ESC, DSC, TCS) may also illuminate
- Loss or reduction of ABS/traction control functionality
- Brake system messages or reduced braking assistance on some vehicles
- Codes may be intermittent and return after road vibration or moisture exposure
What to check
- Read freeze frame and pending codes with a capable scan tool; record status and conditions
- Visually inspect wiring and connector for the pressure differential switch for corrosion, damage or pin distortion
- Check for water, grease or debris in the connector; look for repair splice points or areas prone to chafe
- With ignition ON (engine off), backprobe the switch signal wire and measure voltage; look for ~reference voltage (pull‑up) or 0 V depending on switch state
- Check continuity from the switch signal pin to chassis ground (should not be continuous unless switch is designed to ground when activated)
- Perform a wiggle test on harness while monitoring the signal and checking for code recurrence
Signal parameters
- Typical signal type: single switched/logic input (closed to ground when actuated or open with pull‑up to module reference voltage)
- Expected voltage when switch is open (inactive): approximately module pull‑up voltage (commonly ~4–5 V)
- Expected voltage when switch is closed (active): approximately 0 V (grounded)
- Short‑to‑ground condition: signal measures ~0 V continuously regardless of hydraulic state
- Open‑circuit condition: signal may float near pull‑up voltage or show high resistance
Diagnostic algorithm
- Connect a scan tool and confirm C1241 and any related codes; note freeze frame and clear codes to see if code returns.
- Visually inspect the wiring and connector at the hydraulic pressure differential switch and along the harness to the ABS module. Repair obvious damage.
- With the connector disconnected, check continuity from the switch signal pin to chassis ground. If continuity exists when the switch is not actuated, suspect a short in the wiring or internal short in the switch.
- Reconnect connector. With ignition ON, backprobe the signal wire and measure voltage. Compare to expected pull‑up (~4–5 V) and check for 0 V when switch should be active. Wiggle harness and operate brakes (or cycle pressure per service manual) to reproduce fault.
- If signal is always at or near 0 V, isolate by disconnecting the switch and measuring at the module connector. If the module input still reads 0 V with the switch disconnected, the short is in wiring or module side; if it reads pull‑up voltage, the switch is shorted—replace the switch.
- Repair any found wiring damage, repair/replace corroded connectors or pigtail, and secure harness away from moving parts. Replace the pressure differential switch if its internal circuit is faulty.
- If wiring and switch test good but code persists, check module grounds and perform module connector inspection; consider testing or replacing ABS control module if internal input circuit is damaged.
- After repairs, clear codes and perform a road test to confirm the code does not return and ABS/ESC function is restored.
Likely causes
- Wiring short to chassis ground near the brake lines, caliper, wheel area or ABS modulator
- Faulty or damaged pressure differential switch
- Corroded connector at the switch (moisture ingress)
- Loose or corroded ground(s) at chassis or ABS module
- Intermittent internal failure in ABS/ESP control module (less common)
Fault status
Status
ABS hydraulic pressure differential switch input detected short to ground. ABS/ESC functions may be disabled. Further diagnosis required to identify wiring, connector, sensor or module fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
C1241
HYUNDAI
C — Chassis
Rear Height Sensor Low | TCS Message Fault | Force Sensor Failure
Views:
UK: 20
EN: 24
RU: 17
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with insulation rubbed through and contacting chassis ground
- Corroded, bent or pushed‑out connector pins at the pressure differential switch or module
- Failed pressure differential switch (internal short)
- Water intrusion or contamination in connector or switch
- Poor or missing ground or fault in ABS control module input circuitry
Symptoms
- ABS warning lamp illuminated
- Traction control / stability control warning (ESC, DSC, TCS) may also illuminate
- Loss or reduction of ABS/traction control functionality
- Brake system messages or reduced braking assistance on some vehicles
- Codes may be intermittent and return after road vibration or moisture exposure
What to check
- Read freeze frame and pending codes with a capable scan tool; record status and conditions
- Visually inspect wiring and connector for the pressure differential switch for corrosion, damage or pin distortion
- Check for water, grease or debris in the connector; look for repair splice points or areas prone to chafe
- With ignition ON (engine off), backprobe the switch signal wire and measure voltage; look for ~reference voltage (pull‑up) or 0 V depending on switch state
- Check continuity from the switch signal pin to chassis ground (should not be continuous unless switch is designed to ground when activated)
- Perform a wiggle test on harness while monitoring the signal and checking for code recurrence
Signal parameters
- Typical signal type: single switched/logic input (closed to ground when actuated or open with pull‑up to module reference voltage)
- Expected voltage when switch is open (inactive): approximately module pull‑up voltage (commonly ~4–5 V)
- Expected voltage when switch is closed (active): approximately 0 V (grounded)
- Short‑to‑ground condition: signal measures ~0 V continuously regardless of hydraulic state
- Open‑circuit condition: signal may float near pull‑up voltage or show high resistance
Diagnostic algorithm
- Connect a scan tool and confirm C1241 and any related codes; note freeze frame and clear codes to see if code returns.
- Visually inspect the wiring and connector at the hydraulic pressure differential switch and along the harness to the ABS module. Repair obvious damage.
- With the connector disconnected, check continuity from the switch signal pin to chassis ground. If continuity exists when the switch is not actuated, suspect a short in the wiring or internal short in the switch.
- Reconnect connector. With ignition ON, backprobe the signal wire and measure voltage. Compare to expected pull‑up (~4–5 V) and check for 0 V when switch should be active. Wiggle harness and operate brakes (or cycle pressure per service manual) to reproduce fault.
- If signal is always at or near 0 V, isolate by disconnecting the switch and measuring at the module connector. If the module input still reads 0 V with the switch disconnected, the short is in wiring or module side; if it reads pull‑up voltage, the switch is shorted—replace the switch.
- Repair any found wiring damage, repair/replace corroded connectors or pigtail, and secure harness away from moving parts. Replace the pressure differential switch if its internal circuit is faulty.
- If wiring and switch test good but code persists, check module grounds and perform module connector inspection; consider testing or replacing ABS control module if internal input circuit is damaged.
- After repairs, clear codes and perform a road test to confirm the code does not return and ABS/ESC function is restored.
Likely causes
- Wiring short to chassis ground near the brake lines, caliper, wheel area or ABS modulator
- Faulty or damaged pressure differential switch
- Corroded connector at the switch (moisture ingress)
- Loose or corroded ground(s) at chassis or ABS module
- Intermittent internal failure in ABS/ESP control module (less common)
Fault status
Status
ABS hydraulic pressure differential switch input detected short to ground. ABS/ESC functions may be disabled. Further diagnosis required to identify wiring, connector, sensor or module fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
C1241
MITSUBISHI
C — Chassis
FL outlet valve
Views:
UK: 8
EN: 13
RU: 12
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with insulation rubbed through and contacting chassis ground
- Corroded, bent or pushed‑out connector pins at the pressure differential switch or module
- Failed pressure differential switch (internal short)
- Water intrusion or contamination in connector or switch
- Poor or missing ground or fault in ABS control module input circuitry
Symptoms
- ABS warning lamp illuminated
- Traction control / stability control warning (ESC, DSC, TCS) may also illuminate
- Loss or reduction of ABS/traction control functionality
- Brake system messages or reduced braking assistance on some vehicles
- Codes may be intermittent and return after road vibration or moisture exposure
What to check
- Read freeze frame and pending codes with a capable scan tool; record status and conditions
- Visually inspect wiring and connector for the pressure differential switch for corrosion, damage or pin distortion
- Check for water, grease or debris in the connector; look for repair splice points or areas prone to chafe
- With ignition ON (engine off), backprobe the switch signal wire and measure voltage; look for ~reference voltage (pull‑up) or 0 V depending on switch state
- Check continuity from the switch signal pin to chassis ground (should not be continuous unless switch is designed to ground when activated)
- Perform a wiggle test on harness while monitoring the signal and checking for code recurrence
Signal parameters
- Typical signal type: single switched/logic input (closed to ground when actuated or open with pull‑up to module reference voltage)
- Expected voltage when switch is open (inactive): approximately module pull‑up voltage (commonly ~4–5 V)
- Expected voltage when switch is closed (active): approximately 0 V (grounded)
- Short‑to‑ground condition: signal measures ~0 V continuously regardless of hydraulic state
- Open‑circuit condition: signal may float near pull‑up voltage or show high resistance
Diagnostic algorithm
- Connect a scan tool and confirm C1241 and any related codes; note freeze frame and clear codes to see if code returns.
- Visually inspect the wiring and connector at the hydraulic pressure differential switch and along the harness to the ABS module. Repair obvious damage.
- With the connector disconnected, check continuity from the switch signal pin to chassis ground. If continuity exists when the switch is not actuated, suspect a short in the wiring or internal short in the switch.
- Reconnect connector. With ignition ON, backprobe the signal wire and measure voltage. Compare to expected pull‑up (~4–5 V) and check for 0 V when switch should be active. Wiggle harness and operate brakes (or cycle pressure per service manual) to reproduce fault.
- If signal is always at or near 0 V, isolate by disconnecting the switch and measuring at the module connector. If the module input still reads 0 V with the switch disconnected, the short is in wiring or module side; if it reads pull‑up voltage, the switch is shorted—replace the switch.
- Repair any found wiring damage, repair/replace corroded connectors or pigtail, and secure harness away from moving parts. Replace the pressure differential switch if its internal circuit is faulty.
- If wiring and switch test good but code persists, check module grounds and perform module connector inspection; consider testing or replacing ABS control module if internal input circuit is damaged.
- After repairs, clear codes and perform a road test to confirm the code does not return and ABS/ESC function is restored.
Likely causes
- Wiring short to chassis ground near the brake lines, caliper, wheel area or ABS modulator
- Faulty or damaged pressure differential switch
- Corroded connector at the switch (moisture ingress)
- Loose or corroded ground(s) at chassis or ABS module
- Intermittent internal failure in ABS/ESP control module (less common)
Fault status
Status
ABS hydraulic pressure differential switch input detected short to ground. ABS/ESC functions may be disabled. Further diagnosis required to identify wiring, connector, sensor or module fault.
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?
Your feedback helps improve AI descriptions.
👍 Like
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Send to email
Code
C1241
Other
C — Chassis
ABS Hydraulic Pressure Differential Switch Input Short Circuit To Ground
Views:
UK: 20
EN: 25
RU: 23
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with insulation rubbed through and contacting chassis ground
- Corroded, bent or pushed‑out connector pins at the pressure differential switch or module
- Failed pressure differential switch (internal short)
- Water intrusion or contamination in connector or switch
- Poor or missing ground or fault in ABS control module input circuitry
Symptoms
- ABS warning lamp illuminated
- Traction control / stability control warning (ESC, DSC, TCS) may also illuminate
- Loss or reduction of ABS/traction control functionality
- Brake system messages or reduced braking assistance on some vehicles
- Codes may be intermittent and return after road vibration or moisture exposure
What to check
- Read freeze frame and pending codes with a capable scan tool; record status and conditions
- Visually inspect wiring and connector for the pressure differential switch for corrosion, damage or pin distortion
- Check for water, grease or debris in the connector; look for repair splice points or areas prone to chafe
- With ignition ON (engine off), backprobe the switch signal wire and measure voltage; look for ~reference voltage (pull‑up) or 0 V depending on switch state
- Check continuity from the switch signal pin to chassis ground (should not be continuous unless switch is designed to ground when activated)
- Perform a wiggle test on harness while monitoring the signal and checking for code recurrence
Signal parameters
- Typical signal type: single switched/logic input (closed to ground when actuated or open with pull‑up to module reference voltage)
- Expected voltage when switch is open (inactive): approximately module pull‑up voltage (commonly ~4–5 V)
- Expected voltage when switch is closed (active): approximately 0 V (grounded)
- Short‑to‑ground condition: signal measures ~0 V continuously regardless of hydraulic state
- Open‑circuit condition: signal may float near pull‑up voltage or show high resistance
Diagnostic algorithm
- Connect a scan tool and confirm C1241 and any related codes; note freeze frame and clear codes to see if code returns.
- Visually inspect the wiring and connector at the hydraulic pressure differential switch and along the harness to the ABS module. Repair obvious damage.
- With the connector disconnected, check continuity from the switch signal pin to chassis ground. If continuity exists when the switch is not actuated, suspect a short in the wiring or internal short in the switch.
- Reconnect connector. With ignition ON, backprobe the signal wire and measure voltage. Compare to expected pull‑up (~4–5 V) and check for 0 V when switch should be active. Wiggle harness and operate brakes (or cycle pressure per service manual) to reproduce fault.
- If signal is always at or near 0 V, isolate by disconnecting the switch and measuring at the module connector. If the module input still reads 0 V with the switch disconnected, the short is in wiring or module side; if it reads pull‑up voltage, the switch is shorted—replace the switch.
- Repair any found wiring damage, repair/replace corroded connectors or pigtail, and secure harness away from moving parts. Replace the pressure differential switch if its internal circuit is faulty.
- If wiring and switch test good but code persists, check module grounds and perform module connector inspection; consider testing or replacing ABS control module if internal input circuit is damaged.
- After repairs, clear codes and perform a road test to confirm the code does not return and ABS/ESC function is restored.
Likely causes
- Wiring short to chassis ground near the brake lines, caliper, wheel area or ABS modulator
- Faulty or damaged pressure differential switch
- Corroded connector at the switch (moisture ingress)
- Loose or corroded ground(s) at chassis or ABS module
- Intermittent internal failure in ABS/ESP control module (less common)
Fault status
Status
ABS hydraulic pressure differential switch input detected short to ground. ABS/ESC functions may be disabled. Further diagnosis required to identify wiring, connector, sensor or module fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
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6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop ManualAudi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
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Workshop ManualAudi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop ManualAudi Q4 e-tron (Type F4) - Self-study Programme SSP 685
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Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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