What Is Code P0208?
Code P0208 is a diagnostic trouble code (DTC) that indicates the engine control module (ECM) has detected an electrical fault in the fuel injector circuit for cylinder 8. This code is specific to V8 engines, where cylinder 8 is typically the last cylinder in the firing order. The fault can be either an open circuit (a break in the electrical path) or a short circuit (an unintended connection causing excessive current flow).
What Does P0208 Mean?
The P0208 code breaks down as follows:
- P = Powertrain
- 0 = Generic OBD-II code
- 2 = Fuel and Air Metering
- 08 = Cylinder 8 Injector Circuit
When the ECM commands the fuel injector for cylinder 8 to open and close, it monitors the electrical resistance and current flow in the circuit. If the ECM detects abnormal voltage or resistance—either too high (open circuit) or too low (short circuit)—it sets code P0208 and illuminates the check engine light.
This is a moderate severity code. While it won’t typically prevent your vehicle from starting, it will cause cylinder 8 to run lean or not fire properly, leading to misfires, rough idle, and poor fuel economy.
Common Symptoms
- Check Engine Light (CEL) illuminated on the dashboard
- Rough idle or hesitation during acceleration
- Engine misfire in cylinder 8, sometimes felt as a vibration or stumble
- Reduced fuel economy (vehicle uses more gas than normal)
- Loss of power during acceleration or under load
- Difficulty starting the engine (in severe cases)
- Black smoke from exhaust (if the injector is stuck open)
- Vehicle may run fine at idle but hesitate under load
Possible Causes (Ranked by Frequency)
1. Faulty Fuel Injector (Most Common)
The fuel injector itself may have failed electrically. Internal coil damage, corrosion, or mechanical wear can prevent the injector from responding to electrical signals from the ECM. This is the most common cause of P0208.
2. Damaged Injector Wiring or Connectors
The wiring harness leading to the cylinder 8 injector may be pinched, frayed, or corroded. Connector pins can become loose, corroded, or damaged, breaking the electrical circuit. Water intrusion into connectors is also a common culprit.
3. Faulty Fuel Injector Relay
The relay that controls power to the fuel injector circuit may be defective, preventing proper voltage from reaching the injector. A bad relay can cause an open circuit condition.
4. ECM or PCM Issue
In rare cases, the engine control module itself may have a faulty driver circuit for cylinder 8, causing it to incorrectly detect a problem or fail to send proper signals to the injector.
5. Corroded or Loose Battery Connections
Poor battery connections or corroded battery terminals can cause voltage fluctuations throughout the vehicle’s electrical system, affecting fuel injector circuits.
6. Blown Fuel Injector Fuse
A blown fuse in the fuel injector circuit will cause an open circuit condition and trigger P0208.
Diagnostic Steps
Step 1: Scan the Vehicle
Use an OBD-II scanner to confirm code P0208 and check for any additional related codes (such as P0207 for cylinder 7 or other cylinder-specific injector codes). Note the freeze frame data, which shows engine conditions when the code was set.
Step 2: Perform a Visual Inspection
Locate the cylinder 8 fuel injector and its wiring harness. Look for:
- Visible damage, pinching, or fraying of wires
- Corrosion on connectors or terminals
- Loose or disconnected connectors
- Water or debris in connector sockets
- Burnt or melted plastic on connectors
Step 3: Check the Connector
Disconnect the fuel injector connector for cylinder 8. Inspect the pins for corrosion, damage, or looseness. Gently wiggle the connector while the ignition is on (without starting) and listen for the injector to click. If you hear a click, the injector may be responding. If not, there’s likely an electrical break.
Step 4: Test Injector Resistance
Using a multimeter set to ohms (resistance), measure the resistance across the fuel injector terminals. Most fuel injectors have a resistance between 12-16 ohms. If the reading is infinite (∞) or zero, the injector is faulty and needs replacement.
Step 5: Check Wiring and Voltage
With the ignition on and the engine off, use a multimeter to check for voltage at the fuel injector connector. You should see approximately 12 volts. If there’s no voltage, trace the wiring back to the fuel injector relay and fuse. Check that the fuse is not blown and the relay is functioning.
Step 6: Inspect the Fuel Injector Relay
Locate the fuel injector relay (typically in the engine bay fuse/relay box). Swap it with an identical relay from another circuit (like the horn relay) and retest. If the code clears, the relay was faulty.
Step 7: Clear the Code and Test Drive
After repairs, clear the code using your scanner and take the vehicle for a test drive. Monitor for code return. If the code returns immediately, the repair was unsuccessful and further diagnosis is needed.
Repair Cost Estimates
Fuel Injector Replacement: $150–$400 per injector (parts and labor)
- OEM fuel injectors: $100–$250 each
- Aftermarket fuel injectors: $50–$150 each
- Labor: $75–$150 per hour (typically 0.5–1 hour)
Wiring Repair or Connector Replacement: $75–$250
- Simple connector cleaning or pin replacement: $50–$100
- Wiring harness repair or replacement: $150–$300
Fuel Injector Relay Replacement: $50–$150
- Relay part cost: $20–$50
- Labor: $30–$100
Fuel Injector Fuse Replacement: $10–$50
ECM/PCM Reprogramming or Replacement: $500–$1,500+ (rare)
Total Estimated Cost Range: $100–$500 (most common scenarios)
Can I Still Drive?
Short Answer: You can drive, but it’s not ideal.
Code P0208 is a moderate severity code. Your vehicle will likely start and run, but with noticeable performance issues:
- Safe to drive: Yes, for short distances to a repair shop
- Performance impact: Moderate—expect rough idle, hesitation, and reduced power
- Fuel economy: Will be noticeably worse
- Long-term damage risk: Low, but continued driving may cause unburned fuel to damage the catalytic converter over time
Recommendation: Have the code diagnosed and repaired as soon as possible. While you won’t be stranded, the vehicle will be uncomfortable to drive and fuel costs will increase. If you notice severe misfires or the check engine light flashing (which indicates a misfire), stop driving immediately, as this can damage the catalytic converter.
Frequently Asked Questions
Q: Can a bad fuel injector cause multiple cylinder codes?
A: Yes. If the fuel injector relay is faulty, it could affect multiple injectors, potentially setting codes like P0207, P0208, and P0209 simultaneously. However, if only P0208 is set, the problem is isolated to cylinder 8’s injector circuit.
Q: Will cleaning the fuel injector fix code P0208?
A: Cleaning may help if the injector is clogged, but P0208 is an electrical code, not a fuel flow issue. Cleaning won’t fix an open or short circuit. You’ll likely need to replace the injector or repair the wiring.
Q: How much does it cost to replace a fuel injector?
A: Fuel injector replacement typically costs $150–$400 per injector, including parts and labor. OEM injectors are more expensive but often more reliable than aftermarket alternatives.
Q: Can I drive with the check engine light on?
A: Yes, but it’s not recommended for extended periods. The check engine light indicates a problem that needs diagnosis. Continued driving with P0208 may worsen fuel economy and potentially damage the catalytic converter if misfires are severe.
Q: Is P0208 the same as P0207 or P0209?
A: No. P0207 is cylinder 7 injector circuit, P0208 is cylinder 8 injector circuit, and P0209 is cylinder 9 injector circuit. Each code indicates a problem with a specific cylinder’s fuel injector. However, they share the same root cause possibilities.