Code
C1272
HUMMER
C — Chassis
Left Front TCS Prime Valve Malfunction
Views:
UK: 13
EN: 15
RU: 12
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to left front TCS prime valve
- Corroded or loose connector at the valve
- Failed solenoid/valve assembly (stuck, clogged, or electrically open)
- Faulty ABS/TCS hydraulic control module or internal driver circuit
- Low battery voltage or blown fuse/relay for ABS/TCS system
- Hydraulic contamination or internal blockage in valve body
Symptoms
- ABS and/or TCS warning lamp illuminated
- Traction control and ABS functions reduced or disabled
- Possible abnormal brake feel during ABS activation or reduced modulation
- System stores related ABS/TCS DTCs
- Possible diagnostic trouble under wet/icy acceleration conditions
What to check
- Use a scan tool to read C1272 and any related codes; capture freeze-frame and live data
- Visually inspect left front valve connector and harness for corrosion, damage, water intrusion or chafing
- Check ABS/TCS fuses and relays for proper condition and continuity
- Confirm vehicle battery voltage is within spec with key on/engine running
- Back-probe valve connector to verify power (12V) and good ground
- Measure valve coil resistance at the connector with harness disconnected and compare to service spec
Signal parameters
- Supply voltage at valve connector: ~11–14 V with ignition ON/run (verify with manual)
- Valve coil resistance: typically low ohms (common range 4–30 Ω) — check vehicle service specification
- Control signal: PWM/duty-cycle from ABS module (frequency and duty vary by manufacturer) — expected to vary with ABS/TCS activity
- No continuity to ground when circuit open (shorts to ground or battery present indicate wiring fault)
- Live-data: valve commanded states should change with ABS active tests (refer to service procedures)
Diagnostic algorithm
- Connect a bidirectional scan tool; record C1272 and any accompanying codes, and view live data during an ABS/TCS active test.
- Visually inspect left front valve harness and connector for corrosion, bent pins, or damage; repair or replace as needed.
- Check fuses/relays for ABS/TCS circuits and verify battery voltage at the module and valve connector.
- With ignition ON, back-probe valve connector: verify battery feed and a good ground. If power or ground missing, trace harness to find open or short.
- Disconnect valve and measure solenoid coil resistance. If resistance is out of manufacturer spec, replace the valve assembly.
- If coil resistance is within spec, command the valve (if scan tool allows) and monitor for correct response (change in duty, current draw, or pressure pulses).
- Perform wiggle tests on harness/connectors while monitoring live data for intermittent faults.
- If wiring and connector checks pass but valve does not respond or module current driver is abnormal, test ABS/TCS module outputs per factory procedure. Consider replacing valve assembly if confirmed defective.
- After repairs, clear codes, perform ABS/TCS system self-tests and a road test to verify fault does not return.
- If fault persists after valve replacement, inspect/replace ABS/TCS hydraulic control module or seek factory-level diagnostics.
Likely causes
- Corroded/loose connector at left front valve
- Open/short in control or power/ground wiring to valve
- Failed left front prime valve solenoid
- Faulty ABS/TCS module driver circuit
Fault status
Status
Left Front TCS Prime Valve Malfunction — ABS/TCS controller detected valve circuit or operation fault; traction control may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
C1272
HYUNDAI
C — Chassis
Engine Speed - Abnormal | Engine Speed Input-Malfunction
Views:
UK: 12
EN: 18
RU: 11
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to left front TCS prime valve
- Corroded or loose connector at the valve
- Failed solenoid/valve assembly (stuck, clogged, or electrically open)
- Faulty ABS/TCS hydraulic control module or internal driver circuit
- Low battery voltage or blown fuse/relay for ABS/TCS system
- Hydraulic contamination or internal blockage in valve body
Symptoms
- ABS and/or TCS warning lamp illuminated
- Traction control and ABS functions reduced or disabled
- Possible abnormal brake feel during ABS activation or reduced modulation
- System stores related ABS/TCS DTCs
- Possible diagnostic trouble under wet/icy acceleration conditions
What to check
- Use a scan tool to read C1272 and any related codes; capture freeze-frame and live data
- Visually inspect left front valve connector and harness for corrosion, damage, water intrusion or chafing
- Check ABS/TCS fuses and relays for proper condition and continuity
- Confirm vehicle battery voltage is within spec with key on/engine running
- Back-probe valve connector to verify power (12V) and good ground
- Measure valve coil resistance at the connector with harness disconnected and compare to service spec
Signal parameters
- Supply voltage at valve connector: ~11–14 V with ignition ON/run (verify with manual)
- Valve coil resistance: typically low ohms (common range 4–30 Ω) — check vehicle service specification
- Control signal: PWM/duty-cycle from ABS module (frequency and duty vary by manufacturer) — expected to vary with ABS/TCS activity
- No continuity to ground when circuit open (shorts to ground or battery present indicate wiring fault)
- Live-data: valve commanded states should change with ABS active tests (refer to service procedures)
Diagnostic algorithm
- Connect a bidirectional scan tool; record C1272 and any accompanying codes, and view live data during an ABS/TCS active test.
- Visually inspect left front valve harness and connector for corrosion, bent pins, or damage; repair or replace as needed.
- Check fuses/relays for ABS/TCS circuits and verify battery voltage at the module and valve connector.
- With ignition ON, back-probe valve connector: verify battery feed and a good ground. If power or ground missing, trace harness to find open or short.
- Disconnect valve and measure solenoid coil resistance. If resistance is out of manufacturer spec, replace the valve assembly.
- If coil resistance is within spec, command the valve (if scan tool allows) and monitor for correct response (change in duty, current draw, or pressure pulses).
- Perform wiggle tests on harness/connectors while monitoring live data for intermittent faults.
- If wiring and connector checks pass but valve does not respond or module current driver is abnormal, test ABS/TCS module outputs per factory procedure. Consider replacing valve assembly if confirmed defective.
- After repairs, clear codes, perform ABS/TCS system self-tests and a road test to verify fault does not return.
- If fault persists after valve replacement, inspect/replace ABS/TCS hydraulic control module or seek factory-level diagnostics.
Likely causes
- Corroded/loose connector at left front valve
- Open/short in control or power/ground wiring to valve
- Failed left front prime valve solenoid
- Faulty ABS/TCS module driver circuit
Fault status
Status
Left Front TCS Prime Valve Malfunction — ABS/TCS controller detected valve circuit or operation fault; traction control may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
C1272
Other
C — Chassis
Motor # 2 Input Circuit Failure
Views:
UK: 20
EN: 27
RU: 16
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to left front TCS prime valve
- Corroded or loose connector at the valve
- Failed solenoid/valve assembly (stuck, clogged, or electrically open)
- Faulty ABS/TCS hydraulic control module or internal driver circuit
- Low battery voltage or blown fuse/relay for ABS/TCS system
- Hydraulic contamination or internal blockage in valve body
Symptoms
- ABS and/or TCS warning lamp illuminated
- Traction control and ABS functions reduced or disabled
- Possible abnormal brake feel during ABS activation or reduced modulation
- System stores related ABS/TCS DTCs
- Possible diagnostic trouble under wet/icy acceleration conditions
What to check
- Use a scan tool to read C1272 and any related codes; capture freeze-frame and live data
- Visually inspect left front valve connector and harness for corrosion, damage, water intrusion or chafing
- Check ABS/TCS fuses and relays for proper condition and continuity
- Confirm vehicle battery voltage is within spec with key on/engine running
- Back-probe valve connector to verify power (12V) and good ground
- Measure valve coil resistance at the connector with harness disconnected and compare to service spec
Signal parameters
- Supply voltage at valve connector: ~11–14 V with ignition ON/run (verify with manual)
- Valve coil resistance: typically low ohms (common range 4–30 Ω) — check vehicle service specification
- Control signal: PWM/duty-cycle from ABS module (frequency and duty vary by manufacturer) — expected to vary with ABS/TCS activity
- No continuity to ground when circuit open (shorts to ground or battery present indicate wiring fault)
- Live-data: valve commanded states should change with ABS active tests (refer to service procedures)
Diagnostic algorithm
- Connect a bidirectional scan tool; record C1272 and any accompanying codes, and view live data during an ABS/TCS active test.
- Visually inspect left front valve harness and connector for corrosion, bent pins, or damage; repair or replace as needed.
- Check fuses/relays for ABS/TCS circuits and verify battery voltage at the module and valve connector.
- With ignition ON, back-probe valve connector: verify battery feed and a good ground. If power or ground missing, trace harness to find open or short.
- Disconnect valve and measure solenoid coil resistance. If resistance is out of manufacturer spec, replace the valve assembly.
- If coil resistance is within spec, command the valve (if scan tool allows) and monitor for correct response (change in duty, current draw, or pressure pulses).
- Perform wiggle tests on harness/connectors while monitoring live data for intermittent faults.
- If wiring and connector checks pass but valve does not respond or module current driver is abnormal, test ABS/TCS module outputs per factory procedure. Consider replacing valve assembly if confirmed defective.
- After repairs, clear codes, perform ABS/TCS system self-tests and a road test to verify fault does not return.
- If fault persists after valve replacement, inspect/replace ABS/TCS hydraulic control module or seek factory-level diagnostics.
Likely causes
- Corroded/loose connector at left front valve
- Open/short in control or power/ground wiring to valve
- Failed left front prime valve solenoid
- Faulty ABS/TCS module driver circuit
Fault status
Status
Left Front TCS Prime Valve Malfunction — ABS/TCS controller detected valve circuit or operation fault; traction control may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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