P2816 — Pressure Control Solenoid "H"

OBD2 code P2816 flags a problem with the automatic transmission control (pressure control solenoid "H"). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2816 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 automatic transmission control for damage, corrosion, chafing or poor contact.
Subsystem check Check transmission fluid level and condition — dark, burnt fluid points to internal wear.
Subsystem check Read transmission-specific codes and live data (solenoid states, input/output speed) with a capable scanner.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2816 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2816 (parts and labor, USD, independent shop rates): Transmission fluid service: $150–$350; Replace a shift solenoid: $300–$800; Valve body repair or replacement: $700–$1,500; Transmission rebuild or replacement: $2,500–$5,500. Overall, fixing P2816 usually costs between $150 and $5,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose P2816 myself?

Start with a scan: confirm P2816, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the automatic transmission control, and verify the suspect component against live data before buying parts.

What are the symptoms of P2816?

Drivers most often notice: transmission stuck in one gear (limp mode), harsh or delayed shifting, no movement in severe cases, Check Engine or transmission warning light on.

Will P2816 clear itself?

Sometimes P2816 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

Is it safe to drive with P2816?

Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.

What is the most common cause of P2816?

The most common causes are: faulty transmission speed sensor, wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.

What does P2816 mean?

The engine control module sets P2816 when it detects a fault in the automatic transmission control. In practical terms: pressure control solenoid "H". The code belongs to the powertrain (engine/transmission) group of OBD2 codes.

To set P2816, the control module compares live readings of the automatic transmission control against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

Common symptoms of P2816

transmission stuck in one gear (limp mode)
harsh or delayed shifting
no movement in severe cases
Check Engine or transmission warning light on
slipping between gears
shuddering at highway speed

What causes P2816?

internal mechanical wear (clutches, torque converter)
low or degraded transmission fluid
wiring or connector faults in the valve body harness
failed shift or pressure control solenoid

How to diagnose P2816

Connect an OBD2 scanner, confirm P2816 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
Visually inspect the wiring harness and connectors related to the automatic transmission control for damage, corrosion, chafing or poor contact.
Check transmission fluid level and condition — dark, burnt fluid points to internal wear.
Read transmission-specific codes and live data (solenoid states, input/output speed) with a capable scanner.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2816 does not return.

How to fix P2816

Start with the cheapest and most common causes before replacing expensive parts:

Transmission fluid service — $150–$350
Replace a shift solenoid — $300–$800
Valve body repair or replacement — $700–$1,500
Transmission rebuild or replacement — $2,500–$5,500

How much does it cost to fix P2816?

Repair cost depends on which component actually failed. Typical scenarios for P2816 (parts and labor, USD, independent shop rates):

Transmission fluid service: $150–$350
Replace a shift solenoid: $300–$800
Valve body repair or replacement: $700–$1,500
Transmission rebuild or replacement: $2,500–$5,500

Overall, fixing P2816 usually costs between $150 and $5,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2816?