P0344 on 2020-2021 Ford Escape: Cam Sensor Circuit Intermittent Causes & Fixes

What's Unique About the 2020-2021 Ford ESCAPE

For this specific generation of the Ford Escape, P0344 is frequently not a sensor failure. Ford has issued Technical Service Bulletins pointing to a known problem where a specific wiring harness (part of the 14290 harness) rubs against the steering shaft u-joint. This chafing can damage the wiring and cause a short circuit on a 5-volt reference (VREF) line that is shared by multiple sensors. This short often blows the 10A fuse 44 in the under-hood fuse box, triggering P0344 along with a host of other unrelated codes. This makes a thorough visual inspection of that specific harness area the most critical first step in diagnosis.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is on
• Engine stalls intermittently, especially at low speeds or idle
• Difficulty starting the engine, or a crank-no-start condition
🎬 Watch: Troubleshooting a common Ford Escape no-start condition.
• Rough running or engine misfiring
• Engine hesitation or loss of power under load
• Engine dies and will not restart

Most Likely Causes

1. Chafed 14290 Wiring Harness 🔴 High Probability As documented in Ford TSBs SSM 50245 and SSM 50116, the 14290 harness is routed in a way that it can rub against the steering shaft u-joint, wearing through the insulation and causing a short. This is a known design and routing flaw.
   How to confirm: Visually inspect the wiring harness located directly above the steering shaft u-joint, near the upper brake pedal mount. Look for any signs of rubbing, exposed wires, or damage. Check if fuse 44 (10A) in the under-hood fuse box (Battery Junction Box) is blown. The presence of multiple, seemingly unrelated fault codes alongside P0344 is a very strong indicator of this specific issue.
   Typical fix: Repair the damaged wires using solder and heat shrink tubing or appropriate connectors. Secure the repaired harness away from the chafe point using zip ties or re-routing to create clearance. Replace the blown fuse 44.
   Est. part cost: $5-$25 for wiring repair supplies and fuses.
2. Failing Camshaft Position Sensor 🟡 Medium Probability → Shop Engine Camshaft Position Sensor Sensors can fail over time due to heat cycles and internal electronic faults, leading to an intermittent signal before complete failure. This is a common failure point on many vehicles, but on this platform, it should be suspected only after the wiring harness is cleared.
   How to confirm: After confirming the wiring is intact and fuse 44 is good, you can test the sensor. A common DIY method is to swap the intake sensor ('A') with the exhaust sensor ('B', if they are identical parts) and see if the code changes to P0369 (Camshaft Position Sensor 'B' Circuit Intermittent). If the code follows the sensor, the sensor is bad. A more advanced method involves using an oscilloscope to monitor the sensor's signal for dropouts while the engine is running.
   Typical fix: Replace the Camshaft Position Sensor 'A' for Bank 1.
   Est. part cost: $30-$80
3. Poor Electrical Connection ⚪ Low Probability
   How to confirm: Unplug the sensor connector and inspect the terminals on both the sensor and the harness side for corrosion, moisture, backed-out pins, or damage. Ensure the connector clicks securely into place.
   Typical fix: Clean the connector terminals with an electrical contact cleaner and apply dielectric grease to prevent future corrosion. Replace the connector pigtail if it's damaged.
   Est. part cost: $0-$20

Rare But Worth Checking

• Damaged Camshaft Tone Ring: → Shop Engine Camshaft The reluctor wheel (tone ring) on the camshaft that the sensor reads can become damaged, loose, or slip, causing an erratic signal. This is uncommon but possible, especially if there has been other internal engine work or a timing chain issue.
• Failing Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) In very rare instances, the fault can be internal to the PCM itself, such as a faulty driver circuit that can't properly interpret the sensor's signal. This should only be considered after all other possibilities (wiring, sensor, connections) have been exhaustively ruled out.

Diagnosis Steps

1. Read all stored fault codes with an OBD-II scanner. Note if multiple, seemingly unrelated codes are present, as this strongly points to the TSB-documented harness issue.
2. Check fuse 44 (10A) in the under-hood fuse box (also called the Battery Junction Box). If it is blown, this is a very strong indicator of the wiring short circuit.
3. Perform a thorough visual inspection of the 14290 wiring harness. Locate the area directly above the steering shaft u-joint near the brake pedal assembly. You may need to remove lower dash panels for a clear view. Look for any signs of chafing, rubbing, or exposed copper wires where the harness may contact the rotating shaft.
4. If damage is found, disconnect the battery, repair the affected wires (splicing and sealing with heat shrink is recommended), and securely zip-tie the harness away from the steering shaft to prevent recurrence. Replace fuse 44 if it was blown.
5. If no wiring damage is visible and the fuse is good, proceed to inspect the camshaft position sensor's electrical connector for corrosion, damage, or loose pins. Clean and apply dielectric grease as needed.
6. If the wiring and connector are good, test the sensor's operation. You can use a multimeter to check for correct voltage at the connector (typically a 5V reference, ground, and signal wire).
7. Consider swapping the intake and exhaust cam sensors (if they are the same part number) to see if the fault code changes from P0344 to P0369. If it does, the sensor is faulty.
8. If all other steps fail to resolve the issue, replace the camshaft position sensor. After replacement, clear the codes and perform a test drive 🎬 Watch: Step-by-step guide to replacing the camshaft position sensor. to ensure the fault does not return.

Parts You'll Likely Need

• Camshaft Position Sensor (OEM #HX7Z-6B288-A (for 1.5L Engine)) — If the wiring harness is confirmed to be in good condition, the sensor itself is the next most likely component to have failed. Part number may vary by engine, so confirm with VIN.
  Trusted brands: Motorcraft, Bosch, NTK/NGK
  OEM price range: $50-$90
  Aftermarket price range: $30-$60
• Electrical Tape, Wire Connectors, Zip Ties — Required for repairing the chafed 14290 wiring harness, which is the most common cause of this code on this vehicle. Proper repair involves more than just tape; butt connectors with heat shrink are recommended.
  Trusted brands: 3M
  OEM price range: $5-$20
  Aftermarket price range: $5-$20
• 10 Amp Mini Fuse — Needed to replace the blown fuse 44 in the under-hood fuse box after the wiring short is repaired.
  OEM price range: $1-$5
  Aftermarket price range: $1-$5

Related Codes That Often Appear With This One

• P0340 — This code indicates a general fault in the same sensor circuit ('A' Bank 1). P0344 specifies the fault is intermittent. 🎬 See this breakdown of P0344 causes and circuit fixes. They often appear together or interchangeably.
• P06A7, P0840, P2122, P0369, C0040 and others — According to TSBs SSM 50245 and SSM 50116, the specific harness chafing issue on the 2020-2021 Escape can short a shared 5-volt reference (VREF) circuit. This will starve multiple unrelated sensors of their required voltage, causing a wide array of DTCs to appear at the same time as P0344. Seeing a cluster of these codes strongly points to the harness issue.

Technical Service Bulletins (TSBs) & Recalls

• SSM 50245: Notes that a chafed 14290 harness can cause a rough run condition, a blown fuse 44, and a long list of DTCs including P0344.
• SSM 50116: An earlier bulletin describing the same issue with the 14290 harness chafing near the steering shaft, causing a blown fuse and multiple DTCs including P0344.

Platform-Specific Known Issues

• TSB SSM 50245 and SSM 50116: These bulletins from Ford, known as Special Service Messages (SSMs), identify a critical issue where the 14290 wiring harness can chafe on the steering shaft u-joint. This can cause a short circuit on a shared VREF circuit, blow fuse 44, and generate P0344 along with numerous other diagnostic trouble codes. The repair involves inspecting, repairing, and re-securing the harness.

Mechanic-Grade Diagnostic Values

• Camshaft Position Sensor VREF (Reference Voltage) at sensor connector — expected: ~5.0 Volts DC with key on, engine off (KOEO).. Failure: 0 Volts. This indicates a blown fuse 44 or an open/short in the VREF circuit, strongly pointing to the TSB harness issue.
• Camshaft Position Sensor Ground Circuit Resistance — expected: Near 0 Ohms resistance to a known good chassis ground.. Failure: High resistance (more than a few ohms) indicates a poor ground connection, which can cause erratic signals.
• Camshaft Position Sensor Signal Wire (at sensor connector) — expected: A square wave alternating between approximately 0V and 5V when the engine is cranking or running (requires an oscilloscope).. Failure: A flat line, inconsistent pattern, or voltage that does not switch indicates a faulty sensor or wiring issue.

Scan Tool Commands That Help

• Ford IDS (or equivalent high-level scanner): VREF PID Monitoring — When the TSB harness issue is suspected. A technician can monitor the live data PIDs (Parameter IDs) for the 5V reference circuits of multiple sensors at once. If the VREF for the camshaft sensor and several other unrelated sensors all drop to zero simultaneously when the fault occurs, it provides definitive proof of a short on a shared VREF circuit, confirming the TSB diagnosis without needing to find the chafe point visually first.

Wiring & Ground Locations

• 14290 Harness — The main engine wiring harness. The specific chafe point identified in the TSBs is located inside the cabin, directly above the steering shaft universal joint, near the upper brake pedal mount.. This is the location of the most common cause for P0344 on this vehicle. The harness rubs on the rotating steering shaft, causing a short circuit.
• Fuse F44 (BJB) — In the under-hood fuse box, also known as the Battery Junction Box (BJB). It is a 10A mini fuse.. This fuse powers the VREF circuit shared by the camshaft position sensor and other components. When the 14290 harness shorts to ground, this fuse will blow, causing P0344 and other codes.
• G108 — A primary engine ground point, typically located on the front of the engine block.. A poor engine ground can cause a host of intermittent electrical issues and sensor faults. While not the primary cause listed in the TSB, ensuring this ground is clean and tight is a fundamental step in any electrical diagnosis.
• PCM Connector C175b — This is one of the main multi-pin connectors at the Powertrain Control Module (PCM).. The camshaft position sensor wires for signal, VREF, and ground all terminate at this connector. Advanced diagnosis may require checking for voltage and continuity at the specific pins on this connector to isolate a wiring fault between the sensor and the PCM.

Real Owner Repair Stories

• BroncoSportForum.com user (2021 Ford Bronco Sport (shares platform and powertrain with 2020-2021 Escape)) — Vehicle stalled while driving, Check Engine Light on with multiple codes including P0344.
  ❌ Tried (didn't work) Initial diagnosis at a non-dealer shop suggested replacing sensors.
  ✅ What actually fixed it The owner took the vehicle to a Ford dealer who was aware of the TSB. The technician removed the lower dash panel, located the 14290 harness rubbing on the steering shaft, and found exposed wires. The wires were repaired and the harness was secured away from the shaft with zip ties. The blown fuse was replaced, resolving all codes.

When the Usual Fixes Don't Work

• While the TSB-documented wiring harness issue is the most common cause, it is not the only cause. In some documented cases, owners have performed the wiring harness repair correctly, only to have the P0344 code return. The final fix in these instances was to replace the camshaft position sensor itself. This suggests that the initial short circuit in the harness can cause a cascading failure, damaging the sensor's internal electronics. Therefore, if the code persists after a confirmed wiring repair, the sensor should be the next component to be replaced.