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Home / DTC / P1696 — Remote Keyless Entry Voltage High

P1696 — Remote Keyless Entry Voltage High

Detailed page for trouble code P1696.

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Code

P1696

CADILLAC P — Powertrain

Remote Keyless Entry Voltage High

Brand: CADILLAC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty charging system (overcharging alternator or voltage regulator)
  • Poor or corroded ground or power connector to RKE/BCM
  • Short to battery voltage on the RKE power feed
  • Faulty Body Control Module (BCM) or RKE receiver module
  • Aftermarket electrical accessory improperly wired
  • Intermittent wiring fault (pinched chafe, water intrusion)

Symptoms

  • Remote keyless entry intermittent or non-functional (lock/unlock failure)
  • Stored P1696 code, possible additional body/module codes
  • Accessory or body electrical glitches (erratic locks, lights)
  • Possible battery/charging system warning or unusual voltage readings on scan tool
  • Codes may set after jump-starting or during charging

What to check

  • Retrieve freeze frame and any related codes; note conditions code set (engine running, charging, battery voltage)
  • Perform visual inspection of battery terminals, cables, fusible links and ground connections for corrosion or looseness
  • Inspect RKE/BCM connectors and wiring for damage, corrosion, water intrusion or pin pushed out
  • Check for aftermarket accessories tied into battery or BCM circuits
  • Measure battery voltage at rest and with engine running, observe for overvoltage spikes

Signal parameters

  • Normal battery/rest voltage: ~12.2–12.8 V (engine off)
  • Normal charging voltage: ~13.5–14.8 V (engine running)
  • High-voltage condition typically logged when supply exceeds approx. 16 V (threshold varies by model/software)
  • Look for short-duration spikes above normal charging range using a scope or data logging

Diagnostic algorithm

  1. Read all stored codes and freeze frame; record events when P1696 set. Clear codes and attempt to reproduce.
  2. Visually inspect battery, cables, main fuses, fusible links and chassis/engine grounds. Clean and tighten as needed.
  3. Measure battery voltage (key off) and charging voltage (engine running). If charging >14.8 V, investigate alternator/regulator.
  4. With a DVOM (and oscilloscope if available) measure the RKE/BCM power pin voltage at the module connector (key off and running). Watch for spikes and sustained high readings.
  5. Disconnect aftermarket accessories and retest. If fault only occurs when accessory connected, repair aftermarket wiring.
  6. Inspect and repair any damaged wiring or corroded connectors to RKE/BCM; secure grounds and terminals.
  7. If wiring and charging system are within specification, perform module reflash/diagnostic procedures per dealer info or replace RKE/BCM per manufacturer guidance.
  8. Clear codes and road test/operate RKE repeatedly to confirm repair; verify no recurrence and no related codes.

Likely causes

  • Overcharging alternator/voltage regulator
  • Loose/corroded battery positive/negative connections or BCM ground
  • Shorted or damaged RKE power feed wiring or connector
  • Faulty BCM or RKE module electronics
  • Vehicle left on charger/jump-start causing high voltage spike

Fault status

⚠️ Status
Stored when the RKE module (or controlling body module) senses supply voltage above allowed limits on its power feed. May be caused by charging system overvoltage, wiring/ground faults, or module failure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

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206

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