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Home / DTC / U3507 — Control Module Input Power B Circuit Intermittent/Erratic

U3507 — Control Module Input Power B Circuit Intermittent/Erratic

Detailed page for trouble code U3507.

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U3507

Generic U — Network/User

Control Module Input Power B Circuit Intermittent/Erratic

Brand: Generic
Type: U — Network/User
Views: UK: 14 EN: 22 RU: 18
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Page language: EN

Causes

  • Loose, corroded or damaged battery/ignition power connection to the module
  • Blown or partially open fuse or fusible link on Power B circuit
  • Damaged, chafed or shorted wiring harness (open, short to ground or short to battery)
  • Poor or intermittent chassis or engine ground(s) affecting module reference
  • Intermittent ignition switch or relay connection feeding the Power B circuit
  • Water intrusion, corrosion or contaminated connector pins at the module

Symptoms

  • Stored and/or intermittent U3507 fault present; may clear and return
  • Intermittent loss of functions controlled by that module (lighting, instrument cluster, communication, driveability features depending on module)
  • Unexpected resets or reboots of the affected control module
  • Multiple network communication errors or other U-codes present
  • Vehicle may start/operate normally at times and fail or show faults at other times

What to check

  • Read and record freeze frame, occurrence count and related U-codes with a capable scan tool
  • Visually inspect battery terminals, main power feeds, fuses and fusible links for corrosion, looseness or heat damage
  • Inspect module connector(s) for corrosion, bent pins, water entry or loose terminals
  • Measure battery voltage with key off and key on; check voltage under cranking and under load
  • Check integrity of module ground(s; clean and torque to spec)
  • Perform wiggle/strain test of wiring harness while monitoring voltage or live data to reproduce fault

Signal parameters

  • Nominal supply expected: ~12–14.5 V with ignition ON; stable within ±0.5 V
  • Intermittent drops below ~9–10 V or rapid voltage sag during load are indicative of a fault
  • Spikes above normal charging voltage (>15.5–16 V) or high-frequency noise may indicate charging system or regulator issues
  • Open circuit: near 0 V at module power pin with key ON; short to battery: constant battery voltage regardless of ignition state
  • High series resistance: measured voltage lower at module than battery by >0.5–1.0 V under load

Diagnostic algorithm

  1. Connect a scan tool and record current and pending U-codes, freeze frame data and event counters
  2. Visually inspect battery, main power distribution, fuses, fusible links and relay related to Power B circuit
  3. With key ON, backprobe the module Power B input pin and measure voltage at rest and while cycling ignition; compare to battery voltage
  4. Check continuity and resistance between module power pin and the fuse/battery feed; repair any high resistance or open readings
  5. Inspect and clean module connectors; look for corrosion, bent pins, and secure latch engagement. Repair or replace connector as required
  6. Check module ground(s): disconnect, inspect, clean mating surfaces and verify low resistance (
  7. Perform wiggle test on wiring harness and connectors while monitoring voltage/live data to reproduce intermittent behavior
  8. If harness and connectors are good, check upstream components: ignition switch, relays, charging system for abnormal voltage or noise
  9. If wiring/power/ground and external components check good, check for available software updates and reprogram the module per manufacturer procedure
  10. If fault persists after wiring, connectors and software verified, consider module repair or replacement and follow proper programming and configuration steps
  11. After repairs, clear codes and perform a road test under conditions that previously produced the fault; re-scan and confirm issue resolved

Likely causes

  • Loose or corroded connector pin at the module or fusebox
  • Bad ground on the module or nearby grounding strap
  • Partially open fuse or high resistance in fusible link
  • Wiring damage in harness near wheel wells, doors, or engine bay where movement occurs
  • Faulty ignition switch or relay feeding the circuit

Fault status

⚠️ Status
Control Module Input Power B Circuit — Intermittent/Erratic detected on module power supply. Voltage supply is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0121 U0140 U0131 U1000
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