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Home / DTC / P2437 — AIR System Air Flow/Pressure Sensor Circuit Low Bank 2

P2437 — AIR System Air Flow/Pressure Sensor Circuit Low Bank 2

Detailed page for trouble code P2437.

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Code

P2437

Generic P — Powertrain

AIR System Air Flow/Pressure Sensor Circuit Low Bank 2

Brand: Generic
Type: P — Powertrain
Views: UK: 22 EN: 25 RU: 17
AI status
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Page language: EN

Causes

  • Short to ground on the sensor signal circuit
  • Open circuit or high resistance in wiring or connector
  • Failed air flow/pressure sensor (Bank 2)
  • Poor power or reference voltage (blown fuse, bad relay, harness damage)
  • Corroded/loose connector or water intrusion
  • PCM/ECM fault (rare)

Symptoms

  • Check Engine Light (MIL) illuminated and P2437 stored
  • Reduced or disabled secondary air injection operation
  • Possible higher emissions / failed emissions test
  • Rough idle or hesitation if AIR system actively affects engine control
  • P030x or other air/fuel related codes may appear in some cases

What to check

  • Scan and record freeze frame and live data for the AIR flow/pressure sensor (Bank 2) and related PIDs
  • Visually inspect sensor, connector and harness for damage, corrosion, pin push-out, or water
  • Check fuses and relays related to the AIR/secondary air system
  • Backprobe the sensor connector to measure reference, ground and signal voltages with key ON and engine running (if required)
  • Perform wiggle test on harness while monitoring signal for intermittent faults
  • Measure continuity and resistance between sensor ground/signal and PCM connector with battery disconnected

Signal parameters

  • Reference supply: typically 5.0 V reference (nominal) — verify exact vehicle spec
  • Signal output: typically ~0.5–4.5 V depending on flow/pressure (near 0 V or very low voltage indicates low/fault)
  • Fault threshold: signal stuck below ~0.2–0.3 V or at 0 V will usually register as ‘circuit low’
  • Ground: solid chassis/PCM ground; expected near 0 Ω between sensor ground and PCM ground reference
  • Open-circuit: infinite/very high resistance on signal or reference line indicates open wiring

Diagnostic algorithm

  1. Retrieve DTCs, freeze frame and live data with a scan tool; note any related codes. Clear codes after recording and attempt to re-create the fault.
  2. Visual inspection: examine Bank 2 AIR flow/pressure sensor, connector and harness for damage, corrosion, pin damage or water. Repair any visible problems.
  3. Verify power/reference: with ignition ON, backprobe sensor connector and confirm reference voltage (≈5 V) and a good ground. If reference missing, trace to fuse/relay/ECM supply.
  4. Measure sensor signal: with key ON/engine running (as appropriate), measure signal voltage. A voltage near 0 V indicates ‘low’ — check for short to ground on signal wire.
  5. Check continuity: with battery disconnected, measure continuity/resistance from sensor signal/ground pins to the PCM connector. Look for short to ground or open circuit.
  6. Wiggle test: with backprobe connected, wiggle harness and connector while monitoring signal for intermittent changes indicating broken strands or internal connector fault.
  7. Swap or substitute: if available, swap an identical known-good sensor (or swap Bank 1 sensor if identical and appropriate) to see if the code follows the sensor. Do not attempt random swaps on unlike sensors.
  8. Repair: fix wiring shorts/opens, replace corroded connectors, replace sensor if failed, repair or replace blown fuse/relay supply. Ensure connector seals to prevent water ingress.
  9. After repairs, erase codes, run readiness and perform a test drive or functional test to confirm the fault does not return.

Likely causes

  • Damaged/abraded wiring to the Bank 2 AIR flow/pressure sensor
  • Corroded or loose sensor connector on Bank 2
  • Failed air flow/pressure sensor (Bank 2) with internal short
  • Blown fuse or bad relay supplying sensor reference/power
  • Water intrusion or contamination at sensor or harness

Fault status

⚠️ Status
P2437 — AIR System Air Flow/Pressure Sensor Circuit Low (Bank 2). PCM detected a signal from the Bank 2 AIR flow/pressure sensor that is below the expected range, indicating a likely electrical or sensor fault. Inspect wiring, connectors, sensor and power/ground.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P2436 P2438 P0102 P0103 P0113
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