C1354 – Increasing pressure solenoid (right rear) (Toyota)

Toyota-specific code — factory diagnostic data

C1354 means your Toyota C-HR has a fault stored in the ABS/VSC/TRC brake control system that can reduce stability control and ABS performance. You will usually see ABS, VSC, or brake warnings, and the vehicle may brake differently during hard stops. According to Toyota factory diagnostic data, this code indicates a problem in the increasing pressure solenoid circuit for the right rear brake channel. That solenoid lives in the brake actuator assembly and helps the module build hydraulic pressure during ABS and traction events. Treat this code as a pinpoint to a suspect area, not proof of a bad part.

C1354 Quick Answer

C1354 on a Toyota C-HR points to the right rear “increasing pressure” solenoid circuit inside the ABS/VSC/TRC hydraulic control system. Start by verifying power, ground, and wiring integrity at the brake actuator before condemning the actuator.

What Does C1354 Mean?

Official definition: “Increasing pressure solenoid (right rear).” In plain terms, the ABS/VSC/TRC module detected that it cannot correctly control, or correctly verify control of, the solenoid that increases brake pressure for the right rear hydraulic channel. In real driving, that means the system may limit ABS, traction control, and stability interventions because it cannot trust that pressure control on that channel will respond.

What the module checks: the ABS/VSC/TRC ECU commands the solenoid on and off while it monitors the electrical circuit for expected behavior. Depending on Toyota platform design, the ECU may monitor current flow, circuit continuity, and internal driver feedback. Why it matters: the code points you toward a circuit or actuator control problem. You must confirm the wiring, connectors, and power/ground paths before replacing the brake actuator or ECU.

Theory of Operation

Under normal conditions, the Toyota ABS/VSC/TRC system uses a brake actuator with valves and a pump to modulate pressure at each wheel channel. When the ECU needs more pressure at a wheel during control events, it commands an “increasing pressure” solenoid to route or build hydraulic pressure for that channel. The ECU then manages the solenoid rapidly to meet the target slip and stability strategy.

C1354 sets when the ECU commands the right rear increasing pressure solenoid and sees an electrical result that does not match expectations. An open circuit, short to ground, short to power, or high resistance can all block correct current flow. Internal actuator coil faults and ECU driver faults can also trigger the code, but you only consider those after you prove the external circuit works.

Symptoms

Drivers and technicians typically notice one or more of these symptoms with C1354:

• Warning lights ABS, VSC/TRAC, and/or brake warnings illuminated
• ABS function reduced or disabled ABS operation during hard braking
• Stability control VSC/TRC intervention limited, delayed, or unavailable
• Brake feel unusual pedal feel during ABS self-check or low-traction events
• Stored codes additional ABS/VSC/TRC codes related to actuator or solenoid circuits
• Event behavior wheel slip control feels inconsistent on slippery surfaces
• Fail-safe system defaults to hydraulic base brakes with electronic features reduced

Common Causes

• Open circuit in the right rear increasing pressure solenoid control wiring: A broken wire stops the ABS/VSC/TRC module from driving the solenoid and it flags the solenoid circuit as faulty.
• Short to ground on the solenoid control circuit: Chafed insulation can pull the driver low, so the module sees abnormal current flow when it commands pressure increase.
• Short to battery voltage on the solenoid control circuit: A rubbed-through harness can backfeed voltage, so the driver cannot control the solenoid and the module detects an out-of-range condition.
• High resistance at the actuator connector (corrosion or fretting): Added resistance skews solenoid current, especially during ABS events, and the module interprets that as a solenoid or circuit fault.
• Internal fault in the increasing pressure solenoid (right rear) coil: A coil with an internal open or partial short draws incorrect current compared to the commanded state.
• ABS actuator assembly internal circuit issue: The solenoid sits inside the hydraulic actuator, and an internal harness or terminal fault can mimic an external wiring problem.
• Low system voltage during operation: Weak battery, charging issues, or voltage drops can reduce driver headroom and create false solenoid control faults.
• Previous brake or suspension service damage: Pinched harnesses, incorrect routing, or pulled connectors near the actuator can create intermittent opens that set the code.

Diagnosis Steps

You need a scan tool that can access Toyota ABS/VSC/TRC data and run active tests, a quality DMM, and preferably a fused test light for load checks. Use back-probing tools and terminal inspection picks. Have wiring diagrams and connector views for the C-HR platform you are working on. Plan for a careful road test only after you confirm safe brake operation.

1. Confirm C1354 in the ABS/VSC/TRC module and record DTC status (pending, confirmed/stored, history). Save freeze frame data. For this circuit-type code, focus on battery voltage, ignition state, vehicle speed, and any other ABS/VSC/TRC codes that set at the same time.
2. Perform a fast visual inspection before any meter work. Check ABS actuator connectors for full seating, lock engagement, water intrusion, and harness strain. Follow the harness route and look for rub-through, crushed sections, or recent repair evidence.
3. Check fuses and power distribution feeding the ABS/VSC/TRC system. Verify the ABS-related fuses and any IG power feeds with a test light under load, not a meter only. A fuse can pass voltage with no load and fail under load.
4. Verify ABS/VSC/TRC module power and ground integrity with voltage-drop testing under load. Command an ABS actuator function with the scan tool or use an appropriate load. Measure ground drop from module ground to battery negative. Keep drop under 0.1V with the circuit operating.
5. Use the scan tool to review live data and run an actuator/active test for the “increasing pressure solenoid (right rear)” if available. Watch for the command changing while the feedback or system response stays abnormal. If the scan tool supports it, capture a manual snapshot during the active test. Freeze frame shows when the DTC set. A snapshot helps catch an intermittent dropout during your test.
6. Key off and disconnect the ABS actuator connector(s) as service information directs. Inspect terminals closely. Look for spread pins, pushed-out terminals, green corrosion, heat discoloration, or moisture tracks. Correct any connector issues before deeper testing.
7. Check the solenoid control circuit for opens and shorts using the wiring diagram pinouts. Test for continuity from the ABS actuator connector to the module side where applicable on your C-HR configuration. Then check for short to ground and short to power on the control line with connectors unplugged. Do not rely on continuity alone if the harness can flex. Wiggle the harness while monitoring the meter.
8. Load-test the suspect circuit. Use a fused test light or an equivalent load method recommended in Toyota service information to prove the circuit can carry current. A high-resistance wire can pass continuity yet fail under load. Focus on areas where the harness bends or ties down near brackets.
9. Evaluate the solenoid coil integrity using the correct connector pins per the diagram, with the actuator unplugged. Compare resistance to Toyota specifications for that system. Do not guess a “good” number. If resistance reads open, erratic, or far out of spec, treat the solenoid or internal actuator circuit as suspect only after you confirm the external wiring.
10. If wiring and power/grounds test good, re-run the active test and see if C1354 resets immediately. A hard fault often returns right away after clearing. A pending code may require repeated key cycles or drive cycles. Use the DTC status to guide you. A quick return at key-on points to a hard circuit fault rather than an intermittent.
11. After repairs, clear codes and road test in a safe area. Use a scan tool snapshot during a controlled brake application to monitor ABS/VSC/TRC operation and system voltage. Confirm no pending or confirmed C1354 returns and that related ABS/VSC/TRC codes stay clear.

Professional tip: Treat C1354 as a “suspected trouble area,” not a parts verdict. The fastest path on Toyota ABS actuator codes comes from voltage-drop testing and connector scrutiny. Many solenoid codes trace to terminal tension, corrosion, or a harness rub point. Prove the circuit can carry current before you condemn the actuator assembly.

Possible Fixes

• Repair or replace damaged wiring: Restore continuity and correct any short-to-ground or short-to-power found on the right rear increasing pressure solenoid control circuit.
• Connector and terminal service: Clean corrosion, restore terminal tension, repair pushed-out pins, and reseal connectors if water intrusion caused high resistance.
• Power/ground repair: Correct voltage drops by repairing ground points, power feeds, or fuse/relay socket issues that fail under load.
• Harness routing correction: Re-route and secure the harness to prevent repeat chafing after brake or suspension work.
• ABS actuator assembly replacement only after circuit proof: Replace the actuator/hydraulic unit if testing confirms an internal solenoid coil or internal actuator circuit fault and external wiring passes load tests.
• Initialize/calibrate as required: Perform any Toyota-required ABS/VSC/TRC learning, zero-point calibration, or linear valve offset routines after repairs when applicable to the C-HR platform.

Can I Still Drive With C1354?

You can usually drive a Toyota C-HR with C1354, but you should treat it as a brake-system fault until proven otherwise. The ABS/VSC/TRC module uses the increasing pressure solenoid to control hydraulic pressure during ABS and stability events. When the module logs this DTC, it may disable ABS, traction control, and stability control. Normal base braking often remains, but the vehicle can skid easier under hard braking or on slick roads. Avoid towing, steep descents, aggressive driving, and emergency-stop testing. If the brake pedal feel changes, the ABS pump runs constantly, or the brake warning lights stack up, stop driving and diagnose it immediately.

How Serious Is This Code?

C1354 ranges from “mostly an inconvenience” to a real safety concern, depending on what failed and when it fails. If the fault only disables ABS/VSC/TRC, you may only notice warning lights and reduced stability assistance. That still matters in rain, snow, gravel, or panic stops. If the fault involves a shorted solenoid circuit, poor power/ground, or internal hydraulic actuator issues, the ABS pump and valves can behave unpredictably. That can change pedal feel or increase stopping distance during an event. Treat this as high priority if warning lights appear with any brake feel change, unusual pump noise, or repeated code resets right after clearing.

Common Misdiagnoses

Technicians often replace the hydraulic actuator or solenoid assembly too early because the description names a solenoid. The DTC points to a suspected trouble area, not a failed part. The most common misses include skipping the connector check at the ABS actuator, ignoring water intrusion near the harness routing, and failing to load-test the solenoid control circuit. Many also forget to verify ABS/VSC/TRC power and ground integrity with a voltage-drop test while commanding functions. Another frequent error involves blaming wheel speed sensors for every ABS light. A wheel speed issue can set different DTCs, but it does not confirm a right rear pressure-solenoid circuit fault.

Most Likely Fix

The most frequently confirmed repair directions for C1354 on Toyota platforms involve fixing the electrical path to the ABS actuator solenoid, not replacing parts first. Start by correcting terminal fit, corrosion, or harness damage at the ABS hydraulic actuator connector, then verify the solenoid circuit passes continuity and short-to-power/ground checks. If circuit integrity and power/grounds test good under load, the next likely direction involves the ABS hydraulic actuator assembly itself, since the solenoid typically lives inside it. After any repair, confirm the code does not reset during a controlled road test that triggers ABS/VSC self-checks. Enable criteria vary by model and system.

Repair Costs

Repair cost depends on whether the fault is wiring, a solenoid, a valve body component, or internal transmission diagnosis. Confirm the root cause with scan data before committing to a repair.

Last updated: April 9, 2026