P1102 — 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction

Meaning for brands

Chery

For Ford vehicles

mass air flow sensor

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P1102 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the 1-4 upshift (skip shift) solenoid control for damage, corrosion, chafing or poor contact.
Subsystem check Run the module's actuator test for the 1-4 upshift (skip shift) solenoid control if your scanner supports it — a component that does not respond to a direct command is confirmed faulty.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P1102 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P1102 (parts and labor, USD, independent shop rates): Replace the faulty sensor or actuator: $150–$500; Repair wiring or connectors: $80–$250; Control module repair: $300–$1,000. Overall, fixing P1102 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What are the symptoms of P1102?

Drivers most often notice: the affected system operates intermittently or not at all, increased fuel consumption in some cases, possible limp mode depending on the affected component, Check Engine Light on.

Is it safe to drive with P1102?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How much does it cost to fix P1102?

Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250; Control module repair — $300–$1,000. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What is the most common cause of P1102?

The most common causes are: corroded, loose or damaged connector, control module driver fault, blown fuse feeding the circuit.

How do I diagnose P1102 myself?

Start with a scan: confirm P1102, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the 1-4 upshift (skip shift) solenoid control, and verify the suspect component against live data before buying parts.

When your engine control module decides something is wrong with the 1-4 upshift — sometimes called the skip-shift — solenoid control circuit, it logs OBD2 trouble code P1102. Think of this solenoid as a valve that tells your transmission when to skip from first gear directly to fourth under certain light-load cruising conditions. That "skip shift" maneuver is designed to improve fuel efficiency on the highway. When the module runs its self-test and the solenoid doesn't respond the way it should — either because the circuit is open, shorted, or the solenoid itself has failed — P1102 gets set. The key thing to understand is that this is a "malfunction" code, not a simple electrical fault. That wording means the problem could be in the wiring, in the solenoid itself, or in the module's driver circuit that controls it. The ECU won't light up your Check Engine indicator for a single bad reading. It needs to see the same fault occur more than once under specific driving conditions before it commits the code and turns on the light. The freeze-frame data stored alongside P1102 is your best clue — it records engine load, RPM, coolant temperature, and vehicle speed at the exact moment the fault was detected. Use those numbers as a target when you reproduce the problem during testing.

Symptoms of P1102

P1102 can show up in a few different ways depending on what actually failed inside the circuit:

Check Engine Light illuminated — this is the most obvious and common sign that the code is active
Skip-shift function no longer works — the transmission may refuse to shift from first to fourth gear, or it may shift normally and ignore the skip-shift feature entirely
Reduced fuel efficiency — if the skip-shift solenoid stays stuck or the module disables the feature as a fallback, you lose the fuel-saving gear transition
Intermittent operation — the affected system may work one day and fail the next, especially if a wiring connection is loose or corroded
Limp-home mode on some vehicles — depending on the make and model, the ECU may place the transmission in a limited gear range to protect drivetrain components
No other drivability symptoms in many cases — the engine, transmission, and brakes typically function normally apart from the disabled feature

Common Causes of P1102

The root cause of P1102 usually falls into one of four categories, ranked here from most to least frequent:

Failed 1-4 upshift (skip shift) solenoid — the solenoid itself wears out or internal contacts break, causing an open circuit
Wiring or connector problem — broken wires, corroded pins, loose connectors, or chafed insulation interrupt the signal between the module and the solenoid
Poor ground connection — if the ground path for the solenoid circuit is weak or corroded, the module's self-test fails
Control module (ECU/PCM) issue — the driver circuit inside the engine computer that activates the solenoid can fail, though this is relatively uncommon
Blown fuse feeding the circuit — a failed fuse will cut power to the solenoid, causing the self-test to fail
Software calibration gap — some vehicles had factory programming that flagged P1102 under borderline conditions, resolved by a dealer-level software update
Shorted or open circuit elsewhere in the transmission harness — wiring that shares a path with the skip-shift circuit can drag the signal low or high unexpectedly

How to Diagnose P1102

Working through P1102 methodically keeps you from spending money on parts you don't need. Follow these steps in order:

Connect an OBD2 scanner and verify that P1102 is the only code stored — or note any additional codes, because related faults often point to the real root cause. Save the freeze-frame data and write down the engine load, RPM, coolant temperature, and speed values recorded when the fault occurred.
Perform a visual inspection of the wiring harness and connectors associated with the 1-4 upshift solenoid. Pull the connector apart and look for bent pins, greenish corrosion buildup, broken wires near the connector shell, or any signs of chafing where the harness rubs against the transmission case or body structure.
Run the module's actuator test for the skip-shift solenoid if your scan tool supports bidirectional controls. When you command the solenoid on, it should click or you should hear the transmission behave differently. No response means the solenoid or its power/ground path is confirmed faulty.
Measure voltage and ground at the solenoid connector using a multimeter. With the ignition on and the circuit powered, check for proper reference voltage on the signal wire and verify a solid ground. Then check resistance across the solenoid coil — consult your service manual for the correct specification, which is typically between 10 and 30 ohms on most applications.
Perform a wiggle test on the harness while monitoring live data or the scan tool's parameter IDs. If the signal drops out when you move the wiring bundle, you've found a broken wire hidden inside the insulation.
Check the fuse that feeds the solenoid circuit. Replace any blown fuse and investigate why it failed — a second blown fuse after replacement points to a short circuit in the wiring.
Clear the code and drive the vehicle through a complete drive cycle that recreates the freeze-frame conditions — specific load, speed, and temperature values. If P1102 returns, the fault is confirmed and present. If it stays cleared, the problem may have been a temporary electrical glitch.

Repair Options and Cost to Fix P1102

Repair costs for P1102 span a wide range because the culprit could be a simple connector fix or an expensive control module replacement. Here are the typical scenarios at an independent shop, parts and labor included:

Solenoid replacement — $150–$500 depending on the vehicle and whether the solenoid is sold as a standalone part or as part of a transmission valve body assembly
Wiring or connector repair — $80–$250 for harness repair or connector replacement, which is often the fastest and cheapest fix when the problem is visible corrosion or a broken wire
Control module diagnosis and repair — $300–$1,000 if the engine computer itself is at fault; reprogramming at a dealer is sometimes cheaper than replacement, running $150–$300 in that subset of cases

Total out-of-pocket for fixing P1102 typically falls between $80 and $1,000. The single most important money-saving step is a thorough diagnosis before buying any parts. P1102 is one of those codes where the most expensive component — the control module — is rarely the actual problem.

Can You Drive With P1102?

For the majority of vehicles, yes — P1102 does not typically strand you or make the car undrivable. The skip-shift function is a convenience feature for fuel economy, not a safety-critical system. Most drivers report normal engine performance and full transmission operation with this code active. The Check Engine light will remain on, which is a legal and safety concern in emissions-testing states. One exception: if P1102 is accompanied by codes related to the throttle position sensor, crankshaft position sensor, or transmission internal sensors — or if your vehicle enters limp mode — stop driving and have it towed. In those cases, the underlying electrical fault may be affecting broader drivetrain communication.