Code
P1572
GMC
P — Powertrain
ASR Active Circuit Low Too Long
Views:
UK: 39
EN: 48
RU: 40
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the ASR active circuit (short to ground)
- Corroded, loose, or damaged connector at ASR switch/sensor or ABS/traction module
- Failed ASR (traction control) switch or sensor module
- Poor ground or chassis connection for the ABS/traction system
- Blown fuse or failed relay supplying the ASR active circuit
- Low battery or charging system voltage under load
Symptoms
- Traction control/ASR warning lamp illuminated
- Stability control or ABS warning lights may also be lit
- Traction control disabled — vehicle may allow wheel slip on low traction surfaces
- Possible reduced engine power or limp mode depending on vehicle implementation
- Intermittent or persistent loss of traction control function
What to check
- Retrieve freeze frame and full fault list with a scan tool and note related codes and conditions
- Check battery resting voltage and charging system (battery ~12.6V; charging 13.5–14.8V with engine running)
- Visually inspect fuses and relays related to ASR/ABS circuits
- Inspect wiring harnesses and connectors at the ASR switch, ABS/traction module and related ground points for damage, corrosion, or water ingress
- Back-probe the ASR active circuit connector and measure voltage with key on/engine running and while activating ASR (if applicable)
- Perform continuity and resistance checks between the ASR device, module, and ground
Signal parameters
- Expected supply/active voltage: manufacturer-specific — commonly ~5V signal or switched 12V depending on vehicle (consult OEM wiring)
- Low threshold: voltage near 0–1V considered low (any sustained voltage below the OEM threshold may set P1572)
- Battery voltage: ~12.4–12.8V key off; ~13.5–14.8V engine running
- Signal behavior: ASR active circuit should switch to its active state when ASR engages; a stuck-low signal indicates grounding or open-driver failure
Diagnostic algorithm
- Connect a capable scan tool, record freeze frame and related DTCs; note operating conditions when code set.
- Verify battery state of charge and charging system. Repair any low-voltage issues before further diagnosis.
- Inspect fuses/relays for ASR/ABS circuits; replace suspect fuses/relays.
- Visually inspect connectors, wiring, and grounds for the ASR switch, ABS/traction module and associated harnesses; repair any damage/corrosion.
- Back-probe the ASR active circuit at the device and at the module; measure voltage with key ON and while ASR should be active. Compare to OEM expected values.
- Perform continuity/resistance checks from the ASR device to the module and to ground to find opens/shorts.
- Perform a wiggle test on wiring/connectors while monitoring live data to catch intermittent faults.
- Repair or replace damaged wiring, connector pins, grounds, or the ASR switch as indicated by tests. Use dielectric grease on cleaned connectors to prevent corrosion.
- If wiring and connectors are good, consider replacing or reprogramming the ABS/traction module per OEM service information.
- Clear codes and road-test under the same conditions that originally set the code to confirm the repair.
Likely causes
- Chafed harness contacting chassis ground leading to sustained low voltage
- Corroded connector at module causing intermittent low voltage that became persistent
- Failed ASR/traction switch or module driver transistor
- Bad ground strap at ABS/traction module mounting point
- Blown or marginal fuse supplying the ASR active circuit
Fault status
Status
ASR Active Circuit Low Too Long — The traction/ASR active circuit voltage remained below the manufacturer threshold for longer than allowed. The fault is stored and traction/stability control may be disabled until the cause is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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