P0012: A Camshaft Position - Timing Over-Retarded Bank 1
What Does P0012 Mean?
P0012 is a diagnostic trouble code indicating: A Camshaft Position - Timing Over-Retarded Bank 1. This code relates to the fuel and air metering system. It has been reported in NHTSA complaints across 13 different vehicle models.
P0012 is the opposite of P0011 — the intake camshaft is more retarded (delayed) than the ECU commanded. This means the VVT system cannot advance the camshaft when requested, usually because the oil control valve is stuck closed or the oil passages are blocked. A retarded camshaft reduces high-RPM power and efficiency since the engine can't optimize valve overlap for the current conditions.
Common affected vehicles: Toyota Camry/Corolla (2AR-FE, 2GR-FE), Nissan Altima/Sentra (QR25DE), GM Equinox/Terrain (2.4L Ecotec), Honda Accord/Civic (K24, R20), BMW 3-Series (N20/N26), Ford Escape/Focus (EcoBoost). Toyota vehicles typically develop VVT issues around 100K-120K miles. GM Ecotec engines are notorious for timing chain stretch between 60K-120K miles, which was the subject of a class-action lawsuit. Nissan QR25DE engines commonly show VVT codes around 80K-130K miles.
**What To Expect at the Shop for P0012:** When you bring your vehicle to a mechanic for P0012, here's what a thorough diagnostic should include: (1) The technician should connect a professional scan tool and read not just the stored code, but also freeze frame data — this shows the exact conditions (RPM, coolant temp, vehicle speed, fuel trims) when the code was set. (2) They should check for related codes that may point to a root cause. (3) A visual inspection of relevant components and wiring should be performed before any parts are replaced. (4) On reputable shops, diagnostic time is typically 0.5-1.0 hours ($50-$150) before any repair work begins. (5) Be wary of shops that want to immediately replace parts based solely on the code number without performing diagnosis — codes indicate symptoms, not specific failed parts.
Symptoms of P0012
- ⚠️ check engine light
- ⚠️ loss of power at higher RPMs
- ⚠️ poor fuel economy
- ⚠️ rough idle
- ⚠️ hard starting when cold
Common Causes
- 🔍 Low or dirty engine oil
- 🔍 Faulty VVT solenoid (stuck closed)
- 🔍 Clogged oil screen on VVT solenoid
- 🔍 Worn camshaft phaser
P0012 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Two days ago my car was driving perfectly on the highway. The oil pressure light turned on I turned off the highway immediately and put more oil in the car. At this point my car is consuming over a quart every week and I don't drive more than a couple of hundred miles every week. I've taken several "
— Toyota Rav4 owner, 02/21/2023
"CHECK ENGINE CAME ON, TOOK TO LOCAL TOYOTA SHOP, CHECKED CODES, P0012, CAMSHAFT POSITION, "A" TIMING OVER RETARDED-BANK ONE & P0022 SAME FOR BANK NUMBER TWO. ACTIVATED BOTH VVT SYSTEMS & CHECKED OPERATION OF BOTH VVT. ALL WORKING FINE AT THIS TIME. ALL FOUR OIL CONTROL VALVES TEST WORKING FINE AT TH"
— Toyota Tundra owner, 04/10/2014
"AFTER ABOUT 60,000 MILES MY CHECK ENGINE LIGHT ILLUMINATES WITH CODE P0012 EVERY 1,000 MILES AND WHEN I TAKE IT TO TECHNICIAN THEY FIND NOTHING WRONG AFTER RESETTING. THEN AGAIN IT RANDOMLY APPEARS AND HAS BEEN DOING SUCH FOR THE LAST 10,000 MILES. FRUSTRATING. ALSO THE FRONT BRAKES SQUEAL EVER"
— Toyota Sienna owner, 08/06/2019
Source: NHTSA Complaints Database
Most Reported Vehicles for P0012
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | FORD ESCAPE | |
| 2 | NISSAN ROGUE | |
| 3 | TOYOTA RAV4 | |
| 4 | TOYOTA TUNDRA | |
| 5 | TOYOTA SIENNA | |
| 6 | TOYOTA AVALON | |
| 7 | FORD EXPLORER | |
| 8 | FORD FOCUS | |
| 9 | FORD FUSION | |
| 10 | FORD EXPEDITION | |
| 11 | CHEVROLET EQUINOX | |
| 12 | NISSAN VERSA | |
| 13 | KIA OPTIMA |
P0012 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Diagnostic Tips
- Scan all modules, save freeze-frame data, and clear unrelated history codes before focusing on P0012.
- Confirm whether companion codes are present first; they often identify the root cause sooner than the headline DTC.
- Prioritize inspection around engine and the most common failure path for this code family.
- Compare commanded vs actual cam/crank angle at idle and during light acceleration to detect actuator or phaser drift.
- After each repair step, complete one drive cycle and verify readiness monitors instead of judging success after a quick idle test.
- If the code keeps returning on high-incidence platforms (for example FORD ESCAPE), check TSB patterns and wiring/connector fitment before major part replacement.
Common Mistakes to Avoid
- ❌ Skipping freeze-frame review and losing the exact RPM/load conditions when the fault set.
- ❌ Replacing cam sensors before validating oil condition/pressure and actuator control performance.
- ❌ Clearing P0012 and returning the car before monitors complete — this often creates repeat visits.
- ❌ Treating intermittent wiring or connector faults as permanent component failure without wiggle testing.
Frequently Asked Questions
What's the difference between P0011 and P0012?
Can a P0012 cause rough idle?
How long do VVT solenoids last?
Can I use synthetic oil with VVT engines?
Will P0012 cause my check engine light to stay on?
Reported Repair Costs for P0012
Based on 4 owner-reported repair costs from NHTSA complaints.
⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.
What To Do Next
Possible Fixes
- 🔧 Change engine oil and filter
- 🔧 Replace VVT solenoid
- 🔧 Clean or replace VVT solenoid screen
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Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.