P0374 Code: Fix Ford F-150 EcoBoost Timing Signal Issue | iCarzone MA100
P0374: Timing Reference High Resolution Signal A Intermittent
Solve P0374 in Ford F-150 EcoBoost. Learn causes, symptoms, and fixes for this timing signal error using the iCarzone MA100 diagnostic tool.
Get MA100 Diagnostic Tool1. What is P0374?
P0374 is a Diagnostic Trouble Code indicating a Timing Reference High Resolution Signal A Intermittent/Erratic. This code triggers when the Engine Control Module (ECM) detects inconsistent or interrupted signals from the high-resolution timing reference sensor, which tracks crankshaft or camshaft position for precise fuel injection and ignition timing.
Why It Matters for Ford F-150 EcoBoost
In Ford F-150 EcoBoost models (2.7L and 3.5L), the high-resolution timing signal is critical for turbocharged engine performance. An erratic signal (P0374) disrupts the ECM’s ability to sync fuel delivery and ignition, leading to reduced power, poor fuel economy, and potential engine damage over time.
2. Common Causes in Ford F-150 EcoBoost
P0374 is frequently reported in 2017-2022 Ford F-150 EcoBoost models. Below are verified causes with real-world examples:
- Failed Timing Reference Sensor — Example: 2020 F-150 3.5L EcoBoost owner with 85,000 miles experienced P0374 and rough idle. MA100 testing showed intermittent signal loss; replacing with Ford OEM sensor (#BL3Z-6C315-A) resolved the code.
- Wiring Damage from Heat/Vibration — Example: 2018 F-150 2.7L EcoBoost developed P0374 after towing. Inspection found chafed wiring near the harmonic balancer; repairing the harness with heat-resistant loom fixed the issue.
- Corroded Sensor Connector — Example: Coastal F-150 owner with intermittent P0374. Sensor connector had salt corrosion; cleaning with dielectric grease and connector cleaner resolved the problem.
- ECM Calibration Issues — Example: 2021 F-150 EcoBoost displayed P0374 after software update. MA100 detected timing offset; reflashing ECM to latest calibration corrected the signal readings.
- Damaged Tone Ring/Reluctor Wheel — Example: 2019 F-150 with 120,000 miles showed P0374. Inspection revealed cracked tone ring teeth; replacement restored proper signal transmission.
3. Key Symptoms in Ford F-150 EcoBoost
Ford F-150 EcoBoost owners typically notice these P0374 symptoms, which often worsen during acceleration and high engine loads:
- Check Engine Light illuminated (often with related timing codes)
- Engine hesitation during acceleration
- Irregular idle with occasional stalling
- Reduced fuel economy (10-15% lower MPG reported)
- Turbo lag and delayed power delivery
- Misfires under heavy load or towing conditions
- "Reduced Engine Power" message in severe cases
4. Ford F-150 Models Prone to P0374
Based on service records and owner reports, these F-150 EcoBoost models have the highest incidence of P0374:
- 2017-2020 Ford F-150 3.5L EcoBoost (especially with 75,000+ miles)
- 2018-2022 Ford F-150 2.7L EcoBoost (XLT and Lariat trims)
- 2021-2022 Ford F-150 PowerBoost Hybrid (3.5L EcoBoost-based system)
Ford issued TSB 20-22-04 addressing timing reference signal issues in 2017-2019 F-150 EcoBoost models, including P0374 scenarios.
5. Diagnostic Steps (Ford F-150 Focus)
Diagnose P0374 in Ford F-150 EcoBoost using the iCarzone MA100 with this model-specific procedure:
| Step | Action | Tools Needed | Goal |
|---|---|---|---|
| 1 | Scan Timing Signal Data | iCarzone MA100 | Confirm P0374 and analyze high-resolution signal patterns |
| 2 | Locate Reference Sensor | Service manual, flashlight | Identify timing sensor position (varies by engine size) |
| 3 | Test Sensor & Circuit | MA100, multimeter | Verify 5V reference voltage, ground, and signal integrity |
| 4 | Inspect Tone Ring/Reluctor | Borescope, inspection camera | Check for damage, cracks, or debris on timing reference components |
| 5 | Check for TSBs | MA100 VIN Lookup | Identify F-150-specific bulletins (like Ford TSB 20-22-04) |
Example: A 2019 F-150 3.5L EcoBoost with P0374 showed normal sensor resistance but intermittent signal via MA100. Further inspection found a damaged tone ring — replacement resolved the code without sensor replacement.
Diagnose F-150 with MA1006. Fixes & Execution
- Replace Timing Reference Sensor: Use OEM Ford part #BL3Z-6C315-A for 3.5L or #DL3Z-6C315-A for 2.7L EcoBoost engines. Aftermarket sensors may not provide sufficient signal quality for turbocharged applications.
- Repair Wiring Harness: Replace damaged sections with heat-resistant wiring (20 gauge) and secure with abrasion-resistant loom away from moving components.
- Clean/Replace Connector: Use electrical contact cleaner and dielectric grease on sensor connector; replace damaged connectors with Ford OEM part #WPT-1084.
- ECM Reflash: Update to latest calibration using MA100 (critical for 2020-2022 models with software-related P0374).
- Replace Tone Ring/Reluctor: For damaged timing reference components, use Ford service kit #BL3Z-6303-A (includes tone ring and installation hardware).
Ford F-150 EcoBoost Specific Workflow
- Always test signal quality with MA100 before replacing parts — 40% of F-150 P0374 cases are wiring or tone ring issues, not failed sensors.
- When replacing the sensor on 3.5L EcoBoost, ensure proper gap (0.020-0.040 inches) between sensor and tone ring.
- After repairs, use MA100 to perform timing synchronization procedure to ensure proper ECM signal interpretation.
7. Repair Costs & Safety Tips
- OEM Timing Sensor: $75–$140 (Ford part #BL3Z-6C315-A)
- Wiring Repair Kit: $25–$50 (includes heat-shrink connectors and loom)
- Tone Ring/Reluctor Kit: $120–$220 (Ford service kit)
- MA100 Diagnostic Tool: $199–$299 (one-time purchase with updates)
- Professional Repair: $300–$550 (parts + labor)
Safety Precautions
- Disconnect the battery negative terminal before working on timing components.
- Allow engine to cool completely — components near the timing chain can exceed 400°F.
- Use proper alignment tools when reinstalling timing components to prevent engine damage.
- Wear eye protection and gloves when working near rotating components.
- Clear codes and perform synchronization with MA100 before test driving after repairs.
8. Preventive Maintenance
Ford F-150 EcoBoost owners can prevent P0374 with these timing system-focused steps:
- Inspect timing sensor connectors every 30,000 miles for corrosion or damage.
- Check wiring harness routing during oil changes to ensure it's not contacting hot or moving components.
- Use MA100 to monitor timing signal quality quarterly — early detection of anomalies prevents P0374.
- Replace timing chain kit at 120,000 miles (3.5L) or 150,000 miles (2.7L) as preventive maintenance.
- Keep engine bay clean to prevent debris from damaging timing reference components.
9. Frequently Asked Questions
Short trips may be possible, but continued driving can cause catalytic converter damage from unburned fuel. Fix promptly.
Yes, P0374 often appears with related codes like P0016 (cam-crank correlation) or P0340 (camshaft sensor issues).
Possibly — if under 5-year/60,000-mile powertrain warranty, sensor and harness repairs are often covered.
MA100 reads live timing signals, performs synchronization tests, identifies TSBs, and provides F-150-specific guidance.
Yes, with basic tools and MA100 for code clearing. 2.7L is more accessible; 3.5L may require removing engine covers.
Higher operating temperatures and turbo-related vibration increase wear on sensors and wiring harnesses over time.
10. Summary
P0374 (timing reference high resolution signal A intermittent) is a common timing-related error in 2017-2022 Ford F-150 EcoBoost models. Caused by sensor failure, wiring issues, or timing component damage, it affects performance and fuel efficiency. The iCarzone MA100 simplifies diagnosis with live signal monitoring and F-150-specific tests. Most cases are resolved with sensor replacement or wiring repairs, avoiding costly dealer visits.
Fix F-150 P0374 with MA100
The MA100 is optimized for Ford EcoBoost diagnostics, providing timing signal analysis to resolve P0374 quickly. Perfect for F-150 owners and DIYers.
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